feat(miniapp): add admin billing settings foundation

2026-03-31 12:04:02 +00:00 · 2026-03-10 01:38:03 +04:00
parent 4797e4f200
commit 565ac277c1
26 changed files with 5061 additions and 11 deletions
--- a/apps/bot/src/anonymous-feedback.test.ts
+++ b/apps/bot/src/anonymous-feedback.test.ts
@@ -192,7 +192,37 @@ function createHouseholdConfigurationRepository(): HouseholdConfigurationReposit
      preferredLocale: locale,
      householdDefaultLocale: 'ru',
      isAdmin: false
-    })
+    }),
+    getHouseholdBillingSettings: async (householdId) => ({
+      householdId,
+      rentAmountMinor: null,
+      rentCurrency: 'USD',
+      rentDueDay: 20,
+      rentWarningDay: 17,
+      utilitiesDueDay: 4,
+      utilitiesReminderDay: 3,
+      timezone: 'Asia/Tbilisi'
+    }),
+    updateHouseholdBillingSettings: async (input) => ({
+      householdId: input.householdId,
+      rentAmountMinor: input.rentAmountMinor ?? null,
+      rentCurrency: input.rentCurrency ?? 'USD',
+      rentDueDay: input.rentDueDay ?? 20,
+      rentWarningDay: input.rentWarningDay ?? 17,
+      utilitiesDueDay: input.utilitiesDueDay ?? 4,
+      utilitiesReminderDay: input.utilitiesReminderDay ?? 3,
+      timezone: input.timezone ?? 'Asia/Tbilisi'
+    }),
+    listHouseholdUtilityCategories: async () => [],
+    upsertHouseholdUtilityCategory: async (input) => ({
+      id: input.slug ?? 'utility-category-1',
+      householdId: input.householdId,
+      slug: input.slug ?? 'custom',
+      name: input.name,
+      sortOrder: input.sortOrder,
+      isActive: input.isActive
+    }),
+    promoteHouseholdAdmin: async () => null
  }
 }

--- a/apps/bot/src/index.ts
+++ b/apps/bot/src/index.ts
@@ -36,7 +36,11 @@ import { createMiniAppAuthHandler, createMiniAppJoinHandler } from './miniapp-au
 import { createMiniAppDashboardHandler } from './miniapp-dashboard'
 import {
  createMiniAppApproveMemberHandler,
-  createMiniAppPendingMembersHandler
+  createMiniAppPendingMembersHandler,
+  createMiniAppPromoteMemberHandler,
+  createMiniAppSettingsHandler,
+  createMiniAppUpdateSettingsHandler,
+  createMiniAppUpsertUtilityCategoryHandler
 } from './miniapp-admin'
 import { createMiniAppLocalePreferenceHandler } from './miniapp-locale'

@@ -311,6 +315,42 @@ const server = createBotWebhookServer({
        logger: getLogger('miniapp-admin')
      })
    : undefined,
+  miniAppSettings: householdOnboardingService
+    ? createMiniAppSettingsHandler({
+        allowedOrigins: runtime.miniAppAllowedOrigins,
+        botToken: runtime.telegramBotToken,
+        onboardingService: householdOnboardingService,
+        miniAppAdminService: miniAppAdminService!,
+        logger: getLogger('miniapp-admin')
+      })
+    : undefined,
+  miniAppUpdateSettings: householdOnboardingService
+    ? createMiniAppUpdateSettingsHandler({
+        allowedOrigins: runtime.miniAppAllowedOrigins,
+        botToken: runtime.telegramBotToken,
+        onboardingService: householdOnboardingService,
+        miniAppAdminService: miniAppAdminService!,
+        logger: getLogger('miniapp-admin')
+      })
+    : undefined,
+  miniAppUpsertUtilityCategory: householdOnboardingService
+    ? createMiniAppUpsertUtilityCategoryHandler({
+        allowedOrigins: runtime.miniAppAllowedOrigins,
+        botToken: runtime.telegramBotToken,
+        onboardingService: householdOnboardingService,
+        miniAppAdminService: miniAppAdminService!,
+        logger: getLogger('miniapp-admin')
+      })
+    : undefined,
+  miniAppPromoteMember: householdOnboardingService
+    ? createMiniAppPromoteMemberHandler({
+        allowedOrigins: runtime.miniAppAllowedOrigins,
+        botToken: runtime.telegramBotToken,
+        onboardingService: householdOnboardingService,
+        miniAppAdminService: miniAppAdminService!,
+        logger: getLogger('miniapp-admin')
+      })
+    : undefined,
  miniAppLocalePreference: householdOnboardingService
    ? createMiniAppLocalePreferenceHandler({
        allowedOrigins: runtime.miniAppAllowedOrigins,
--- a/apps/bot/src/miniapp-admin.test.ts
+++ b/apps/bot/src/miniapp-admin.test.ts
@@ -8,7 +8,10 @@ import type {

 import {
  createMiniAppApproveMemberHandler,
-  createMiniAppPendingMembersHandler
+  createMiniAppPendingMembersHandler,
+  createMiniAppPromoteMemberHandler,
+  createMiniAppSettingsHandler,
+  createMiniAppUpdateSettingsHandler
 } from './miniapp-admin'
 import { buildMiniAppInitData } from './telegram-miniapp-test-helpers'

@@ -109,7 +112,56 @@ function onboardingRepository(): HouseholdConfigurationRepository {
            householdDefaultLocale: household.defaultLocale,
            isAdmin: false
          }
+        : null,
+    getHouseholdBillingSettings: async (householdId) => ({
+      householdId,
+      rentAmountMinor: 70000n,
+      rentCurrency: 'USD',
+      rentDueDay: 20,
+      rentWarningDay: 17,
+      utilitiesDueDay: 4,
+      utilitiesReminderDay: 3,
+      timezone: 'Asia/Tbilisi'
+    }),
+    updateHouseholdBillingSettings: async (input) => ({
+      householdId: input.householdId,
+      rentAmountMinor: input.rentAmountMinor ?? 70000n,
+      rentCurrency: input.rentCurrency ?? 'USD',
+      rentDueDay: input.rentDueDay ?? 20,
+      rentWarningDay: input.rentWarningDay ?? 17,
+      utilitiesDueDay: input.utilitiesDueDay ?? 4,
+      utilitiesReminderDay: input.utilitiesReminderDay ?? 3,
+      timezone: input.timezone ?? 'Asia/Tbilisi'
+    }),
+    listHouseholdUtilityCategories: async () => [],
+    upsertHouseholdUtilityCategory: async (input) => ({
+      id: input.slug ?? 'utility-category-1',
+      householdId: input.householdId,
+      slug: input.slug ?? 'custom',
+      name: input.name,
+      sortOrder: input.sortOrder,
+      isActive: input.isActive
+    }),
+    promoteHouseholdAdmin: async (householdId, memberId) => {
+      const member = [
+        {
+          id: 'member-123456',
+          householdId,
+          telegramUserId: '123456',
+          displayName: 'Stan',
+          preferredLocale: null,
+          householdDefaultLocale: household.defaultLocale,
+          isAdmin: false
+        }
+      ].find((entry) => entry.id === memberId)
+
+      return member
+        ? {
+            ...member,
+            isAdmin: true
+          }
        : null
+    }
  }
 }

@@ -235,3 +287,216 @@ describe('createMiniAppApproveMemberHandler', () => {
    })
  })
 })
+
+describe('createMiniAppSettingsHandler', () => {
+  test('returns billing settings and admin members for an authenticated admin', async () => {
+    const authDate = Math.floor(Date.now() / 1000)
+    const repository = onboardingRepository()
+    repository.listHouseholdMembersByTelegramUserId = async () => [
+      {
+        id: 'member-123456',
+        householdId: 'household-1',
+        telegramUserId: '123456',
+        displayName: 'Stan',
+        preferredLocale: null,
+        householdDefaultLocale: 'ru',
+        isAdmin: true
+      }
+    ]
+    repository.listHouseholdMembers = async () => [
+      {
+        id: 'member-123456',
+        householdId: 'household-1',
+        telegramUserId: '123456',
+        displayName: 'Stan',
+        preferredLocale: null,
+        householdDefaultLocale: 'ru',
+        isAdmin: true
+      }
+    ]
+
+    const handler = createMiniAppSettingsHandler({
+      allowedOrigins: ['http://localhost:5173'],
+      botToken: 'test-bot-token',
+      onboardingService: createHouseholdOnboardingService({
+        repository
+      }),
+      miniAppAdminService: createMiniAppAdminService(repository)
+    })
+
+    const response = await handler.handler(
+      new Request('http://localhost/api/miniapp/admin/settings', {
+        method: 'POST',
+        headers: {
+          origin: 'http://localhost:5173',
+          'content-type': 'application/json'
+        },
+        body: JSON.stringify({
+          initData: buildMiniAppInitData('test-bot-token', authDate, {
+            id: 123456,
+            first_name: 'Stan',
+            username: 'stanislav',
+            language_code: 'ru'
+          })
+        })
+      })
+    )
+
+    expect(response.status).toBe(200)
+    expect(await response.json()).toEqual({
+      ok: true,
+      authorized: true,
+      settings: {
+        householdId: 'household-1',
+        rentAmountMinor: '70000',
+        rentCurrency: 'USD',
+        rentDueDay: 20,
+        rentWarningDay: 17,
+        utilitiesDueDay: 4,
+        utilitiesReminderDay: 3,
+        timezone: 'Asia/Tbilisi'
+      },
+      categories: [],
+      members: [
+        {
+          id: 'member-123456',
+          householdId: 'household-1',
+          telegramUserId: '123456',
+          displayName: 'Stan',
+          preferredLocale: null,
+          householdDefaultLocale: 'ru',
+          isAdmin: true
+        }
+      ]
+    })
+  })
+})
+
+describe('createMiniAppUpdateSettingsHandler', () => {
+  test('updates billing settings for an authenticated admin', async () => {
+    const authDate = Math.floor(Date.now() / 1000)
+    const repository = onboardingRepository()
+    repository.listHouseholdMembersByTelegramUserId = async () => [
+      {
+        id: 'member-123456',
+        householdId: 'household-1',
+        telegramUserId: '123456',
+        displayName: 'Stan',
+        preferredLocale: null,
+        householdDefaultLocale: 'ru',
+        isAdmin: true
+      }
+    ]
+
+    const handler = createMiniAppUpdateSettingsHandler({
+      allowedOrigins: ['http://localhost:5173'],
+      botToken: 'test-bot-token',
+      onboardingService: createHouseholdOnboardingService({
+        repository
+      }),
+      miniAppAdminService: createMiniAppAdminService(repository)
+    })
+
+    const response = await handler.handler(
+      new Request('http://localhost/api/miniapp/admin/settings/update', {
+        method: 'POST',
+        headers: {
+          origin: 'http://localhost:5173',
+          'content-type': 'application/json'
+        },
+        body: JSON.stringify({
+          initData: buildMiniAppInitData('test-bot-token', authDate, {
+            id: 123456,
+            first_name: 'Stan',
+            username: 'stanislav',
+            language_code: 'ru'
+          }),
+          rentAmountMajor: '750',
+          rentCurrency: 'USD',
+          rentDueDay: 22,
+          rentWarningDay: 19,
+          utilitiesDueDay: 6,
+          utilitiesReminderDay: 5,
+          timezone: 'Asia/Tbilisi'
+        })
+      })
+    )
+
+    expect(response.status).toBe(200)
+    expect(await response.json()).toEqual({
+      ok: true,
+      authorized: true,
+      settings: {
+        householdId: 'household-1',
+        rentAmountMinor: '75000',
+        rentCurrency: 'USD',
+        rentDueDay: 22,
+        rentWarningDay: 19,
+        utilitiesDueDay: 6,
+        utilitiesReminderDay: 5,
+        timezone: 'Asia/Tbilisi'
+      }
+    })
+  })
+})
+
+describe('createMiniAppPromoteMemberHandler', () => {
+  test('promotes a household member to admin for an authenticated admin', async () => {
+    const authDate = Math.floor(Date.now() / 1000)
+    const repository = onboardingRepository()
+    repository.listHouseholdMembersByTelegramUserId = async () => [
+      {
+        id: 'member-123456',
+        householdId: 'household-1',
+        telegramUserId: '123456',
+        displayName: 'Stan',
+        preferredLocale: null,
+        householdDefaultLocale: 'ru',
+        isAdmin: true
+      }
+    ]
+
+    const handler = createMiniAppPromoteMemberHandler({
+      allowedOrigins: ['http://localhost:5173'],
+      botToken: 'test-bot-token',
+      onboardingService: createHouseholdOnboardingService({
+        repository
+      }),
+      miniAppAdminService: createMiniAppAdminService(repository)
+    })
+
+    const response = await handler.handler(
+      new Request('http://localhost/api/miniapp/admin/members/promote', {
+        method: 'POST',
+        headers: {
+          origin: 'http://localhost:5173',
+          'content-type': 'application/json'
+        },
+        body: JSON.stringify({
+          initData: buildMiniAppInitData('test-bot-token', authDate, {
+            id: 123456,
+            first_name: 'Stan',
+            username: 'stanislav',
+            language_code: 'ru'
+          }),
+          memberId: 'member-123456'
+        })
+      })
+    )
+
+    expect(response.status).toBe(200)
+    expect(await response.json()).toEqual({
+      ok: true,
+      authorized: true,
+      member: {
+        id: 'member-123456',
+        householdId: 'household-1',
+        telegramUserId: '123456',
+        displayName: 'Stan',
+        preferredLocale: null,
+        householdDefaultLocale: 'ru',
+        isAdmin: true
+      }
+    })
+  })
+})
--- a/apps/bot/src/miniapp-admin.ts
+++ b/apps/bot/src/miniapp-admin.ts
@@ -1,5 +1,7 @@
 import type { HouseholdOnboardingService, MiniAppAdminService } from '@household/application'
 import type { Logger } from '@household/observability'
+import type { HouseholdBillingSettingsRecord } from '@household/ports'
+import type { MiniAppSessionResult } from './miniapp-auth'

 import {
  allowedMiniAppOrigin,
@@ -38,6 +40,190 @@ async function readApprovalPayload(request: Request): Promise<{
  }
 }

+async function readSettingsUpdatePayload(request: Request): Promise<{
+  initData: string
+  rentAmountMajor?: string
+  rentCurrency?: string
+  rentDueDay: number
+  rentWarningDay: number
+  utilitiesDueDay: number
+  utilitiesReminderDay: number
+  timezone: string
+}> {
+  const clonedRequest = request.clone()
+  const payload = await readMiniAppRequestPayload(request)
+  if (!payload.initData) {
+    throw new Error('Missing initData')
+  }
+
+  const text = await clonedRequest.text()
+  let parsed: {
+    rentAmountMajor?: string
+    rentCurrency?: string
+    rentDueDay?: number
+    rentWarningDay?: number
+    utilitiesDueDay?: number
+    utilitiesReminderDay?: number
+    timezone?: string
+  }
+  try {
+    parsed = JSON.parse(text)
+  } catch {
+    throw new Error('Invalid JSON body')
+  }
+
+  if (
+    typeof parsed.rentDueDay !== 'number' ||
+    typeof parsed.rentWarningDay !== 'number' ||
+    typeof parsed.utilitiesDueDay !== 'number' ||
+    typeof parsed.utilitiesReminderDay !== 'number' ||
+    typeof parsed.timezone !== 'string'
+  ) {
+    throw new Error('Missing billing settings fields')
+  }
+
+  return {
+    initData: payload.initData,
+    ...(typeof parsed.rentAmountMajor === 'string'
+      ? {
+          rentAmountMajor: parsed.rentAmountMajor
+        }
+      : {}),
+    ...(typeof parsed.rentCurrency === 'string'
+      ? {
+          rentCurrency: parsed.rentCurrency
+        }
+      : {}),
+    rentDueDay: parsed.rentDueDay,
+    rentWarningDay: parsed.rentWarningDay,
+    utilitiesDueDay: parsed.utilitiesDueDay,
+    utilitiesReminderDay: parsed.utilitiesReminderDay,
+    timezone: parsed.timezone
+  }
+}
+
+async function readUtilityCategoryPayload(request: Request): Promise<{
+  initData: string
+  slug?: string
+  name: string
+  sortOrder: number
+  isActive: boolean
+}> {
+  const clonedRequest = request.clone()
+  const payload = await readMiniAppRequestPayload(request)
+  if (!payload.initData) {
+    throw new Error('Missing initData')
+  }
+
+  const text = await clonedRequest.text()
+  let parsed: {
+    slug?: string
+    name?: string
+    sortOrder?: number
+    isActive?: boolean
+  }
+  try {
+    parsed = JSON.parse(text)
+  } catch {
+    throw new Error('Invalid JSON body')
+  }
+
+  if (
+    typeof parsed.name !== 'string' ||
+    typeof parsed.sortOrder !== 'number' ||
+    typeof parsed.isActive !== 'boolean'
+  ) {
+    throw new Error('Missing utility category fields')
+  }
+
+  return {
+    initData: payload.initData,
+    ...(typeof parsed.slug === 'string' && parsed.slug.trim().length > 0
+      ? {
+          slug: parsed.slug.trim()
+        }
+      : {}),
+    name: parsed.name,
+    sortOrder: parsed.sortOrder,
+    isActive: parsed.isActive
+  }
+}
+
+async function readPromoteMemberPayload(request: Request): Promise<{
+  initData: string
+  memberId: string
+}> {
+  const clonedRequest = request.clone()
+  const payload = await readMiniAppRequestPayload(request)
+  if (!payload.initData) {
+    throw new Error('Missing initData')
+  }
+
+  const text = await clonedRequest.text()
+  let parsed: { memberId?: string }
+  try {
+    parsed = JSON.parse(text)
+  } catch {
+    throw new Error('Invalid JSON body')
+  }
+
+  const memberId = parsed.memberId?.trim()
+  if (!memberId) {
+    throw new Error('Missing memberId')
+  }
+
+  return {
+    initData: payload.initData,
+    memberId
+  }
+}
+
+function serializeBillingSettings(settings: HouseholdBillingSettingsRecord) {
+  return {
+    householdId: settings.householdId,
+    rentAmountMinor: settings.rentAmountMinor?.toString() ?? null,
+    rentCurrency: settings.rentCurrency,
+    rentDueDay: settings.rentDueDay,
+    rentWarningDay: settings.rentWarningDay,
+    utilitiesDueDay: settings.utilitiesDueDay,
+    utilitiesReminderDay: settings.utilitiesReminderDay,
+    timezone: settings.timezone
+  }
+}
+
+async function authenticateAdminSession(
+  request: Request,
+  sessionService: ReturnType<typeof createMiniAppSessionService>,
+  origin: string | undefined
+): Promise<
+  | Response
+  | {
+      member: NonNullable<MiniAppSessionResult['member']>
+    }
+> {
+  const payload = await readMiniAppRequestPayload(request)
+  if (!payload.initData) {
+    return miniAppJsonResponse({ ok: false, error: 'Missing initData' }, 400, origin)
+  }
+
+  const session = await sessionService.authenticate(payload)
+  if (!session) {
+    return miniAppJsonResponse({ ok: false, error: 'Invalid Telegram init data' }, 401, origin)
+  }
+
+  if (!session.authorized || !session.member) {
+    return miniAppJsonResponse(
+      { ok: false, error: 'Access limited to active household members' },
+      403,
+      origin
+    )
+  }
+
+  return {
+    member: session.member
+  }
+}
+
 export function createMiniAppPendingMembersHandler(options: {
  allowedOrigins: readonly string[]
  botToken: string
@@ -112,6 +298,337 @@ export function createMiniAppPendingMembersHandler(options: {
  }
 }

+export function createMiniAppSettingsHandler(options: {
+  allowedOrigins: readonly string[]
+  botToken: string
+  onboardingService: HouseholdOnboardingService
+  miniAppAdminService: MiniAppAdminService
+  logger?: Logger
+}): {
+  handler: (request: Request) => Promise<Response>
+} {
+  const sessionService = createMiniAppSessionService({
+    botToken: options.botToken,
+    onboardingService: options.onboardingService
+  })
+
+  return {
+    handler: async (request) => {
+      const origin = allowedMiniAppOrigin(request, options.allowedOrigins)
+
+      if (request.method === 'OPTIONS') {
+        return miniAppJsonResponse({ ok: true }, 204, origin)
+      }
+
+      if (request.method !== 'POST') {
+        return miniAppJsonResponse({ ok: false, error: 'Method Not Allowed' }, 405, origin)
+      }
+
+      try {
+        const auth = await authenticateAdminSession(request, sessionService, origin)
+        if (auth instanceof Response) {
+          return auth
+        }
+        const { member } = auth
+
+        const result = await options.miniAppAdminService.getSettings({
+          householdId: member.householdId,
+          actorIsAdmin: member.isAdmin
+        })
+
+        if (result.status === 'rejected') {
+          return miniAppJsonResponse({ ok: false, error: 'Admin access required' }, 403, origin)
+        }
+
+        return miniAppJsonResponse(
+          {
+            ok: true,
+            authorized: true,
+            settings: serializeBillingSettings(result.settings),
+            categories: result.categories,
+            members: result.members
+          },
+          200,
+          origin
+        )
+      } catch (error) {
+        return miniAppErrorResponse(error, origin, options.logger)
+      }
+    }
+  }
+}
+
+export function createMiniAppUpdateSettingsHandler(options: {
+  allowedOrigins: readonly string[]
+  botToken: string
+  onboardingService: HouseholdOnboardingService
+  miniAppAdminService: MiniAppAdminService
+  logger?: Logger
+}): {
+  handler: (request: Request) => Promise<Response>
+} {
+  const sessionService = createMiniAppSessionService({
+    botToken: options.botToken,
+    onboardingService: options.onboardingService
+  })
+
+  return {
+    handler: async (request) => {
+      const origin = allowedMiniAppOrigin(request, options.allowedOrigins)
+
+      if (request.method === 'OPTIONS') {
+        return miniAppJsonResponse({ ok: true }, 204, origin)
+      }
+
+      if (request.method !== 'POST') {
+        return miniAppJsonResponse({ ok: false, error: 'Method Not Allowed' }, 405, origin)
+      }
+
+      try {
+        const payload = await readSettingsUpdatePayload(request)
+        const session = await sessionService.authenticate({
+          initData: payload.initData
+        })
+
+        if (!session) {
+          return miniAppJsonResponse(
+            { ok: false, error: 'Invalid Telegram init data' },
+            401,
+            origin
+          )
+        }
+
+        if (!session.authorized || !session.member) {
+          return miniAppJsonResponse(
+            { ok: false, error: 'Access limited to active household members' },
+            403,
+            origin
+          )
+        }
+
+        const result = await options.miniAppAdminService.updateSettings({
+          householdId: session.member.householdId,
+          actorIsAdmin: session.member.isAdmin,
+          ...(payload.rentAmountMajor !== undefined
+            ? {
+                rentAmountMajor: payload.rentAmountMajor
+              }
+            : {}),
+          ...(payload.rentCurrency
+            ? {
+                rentCurrency: payload.rentCurrency
+              }
+            : {}),
+          rentDueDay: payload.rentDueDay,
+          rentWarningDay: payload.rentWarningDay,
+          utilitiesDueDay: payload.utilitiesDueDay,
+          utilitiesReminderDay: payload.utilitiesReminderDay,
+          timezone: payload.timezone
+        })
+
+        if (result.status === 'rejected') {
+          return miniAppJsonResponse(
+            {
+              ok: false,
+              error:
+                result.reason === 'invalid_settings'
+                  ? 'Invalid billing settings'
+                  : 'Admin access required'
+            },
+            result.reason === 'invalid_settings' ? 400 : 403,
+            origin
+          )
+        }
+
+        return miniAppJsonResponse(
+          {
+            ok: true,
+            authorized: true,
+            settings: serializeBillingSettings(result.settings)
+          },
+          200,
+          origin
+        )
+      } catch (error) {
+        return miniAppErrorResponse(error, origin, options.logger)
+      }
+    }
+  }
+}
+
+export function createMiniAppUpsertUtilityCategoryHandler(options: {
+  allowedOrigins: readonly string[]
+  botToken: string
+  onboardingService: HouseholdOnboardingService
+  miniAppAdminService: MiniAppAdminService
+  logger?: Logger
+}): {
+  handler: (request: Request) => Promise<Response>
+} {
+  const sessionService = createMiniAppSessionService({
+    botToken: options.botToken,
+    onboardingService: options.onboardingService
+  })
+
+  return {
+    handler: async (request) => {
+      const origin = allowedMiniAppOrigin(request, options.allowedOrigins)
+
+      if (request.method === 'OPTIONS') {
+        return miniAppJsonResponse({ ok: true }, 204, origin)
+      }
+
+      if (request.method !== 'POST') {
+        return miniAppJsonResponse({ ok: false, error: 'Method Not Allowed' }, 405, origin)
+      }
+
+      try {
+        const payload = await readUtilityCategoryPayload(request)
+        const session = await sessionService.authenticate({
+          initData: payload.initData
+        })
+
+        if (!session) {
+          return miniAppJsonResponse(
+            { ok: false, error: 'Invalid Telegram init data' },
+            401,
+            origin
+          )
+        }
+
+        if (!session.authorized || !session.member) {
+          return miniAppJsonResponse(
+            { ok: false, error: 'Access limited to active household members' },
+            403,
+            origin
+          )
+        }
+
+        const result = await options.miniAppAdminService.upsertUtilityCategory({
+          householdId: session.member.householdId,
+          actorIsAdmin: session.member.isAdmin,
+          ...(payload.slug
+            ? {
+                slug: payload.slug
+              }
+            : {}),
+          name: payload.name,
+          sortOrder: payload.sortOrder,
+          isActive: payload.isActive
+        })
+
+        if (result.status === 'rejected') {
+          return miniAppJsonResponse(
+            {
+              ok: false,
+              error:
+                result.reason === 'invalid_category'
+                  ? 'Invalid utility category'
+                  : 'Admin access required'
+            },
+            result.reason === 'invalid_category' ? 400 : 403,
+            origin
+          )
+        }
+
+        return miniAppJsonResponse(
+          {
+            ok: true,
+            authorized: true,
+            category: result.category
+          },
+          200,
+          origin
+        )
+      } catch (error) {
+        return miniAppErrorResponse(error, origin, options.logger)
+      }
+    }
+  }
+}
+
+export function createMiniAppPromoteMemberHandler(options: {
+  allowedOrigins: readonly string[]
+  botToken: string
+  onboardingService: HouseholdOnboardingService
+  miniAppAdminService: MiniAppAdminService
+  logger?: Logger
+}): {
+  handler: (request: Request) => Promise<Response>
+} {
+  const sessionService = createMiniAppSessionService({
+    botToken: options.botToken,
+    onboardingService: options.onboardingService
+  })
+
+  return {
+    handler: async (request) => {
+      const origin = allowedMiniAppOrigin(request, options.allowedOrigins)
+
+      if (request.method === 'OPTIONS') {
+        return miniAppJsonResponse({ ok: true }, 204, origin)
+      }
+
+      if (request.method !== 'POST') {
+        return miniAppJsonResponse({ ok: false, error: 'Method Not Allowed' }, 405, origin)
+      }
+
+      try {
+        const payload = await readPromoteMemberPayload(request)
+        const session = await sessionService.authenticate({
+          initData: payload.initData
+        })
+
+        if (!session) {
+          return miniAppJsonResponse(
+            { ok: false, error: 'Invalid Telegram init data' },
+            401,
+            origin
+          )
+        }
+
+        if (!session.authorized || !session.member) {
+          return miniAppJsonResponse(
+            { ok: false, error: 'Access limited to active household members' },
+            403,
+            origin
+          )
+        }
+
+        const result = await options.miniAppAdminService.promoteMemberToAdmin({
+          householdId: session.member.householdId,
+          actorIsAdmin: session.member.isAdmin,
+          memberId: payload.memberId
+        })
+
+        if (result.status === 'rejected') {
+          return miniAppJsonResponse(
+            {
+              ok: false,
+              error:
+                result.reason === 'member_not_found' ? 'Member not found' : 'Admin access required'
+            },
+            result.reason === 'member_not_found' ? 404 : 403,
+            origin
+          )
+        }
+
+        return miniAppJsonResponse(
+          {
+            ok: true,
+            authorized: true,
+            member: result.member
+          },
+          200,
+          origin
+        )
+      } catch (error) {
+        return miniAppErrorResponse(error, origin, options.logger)
+      }
+    }
+  }
+}
+
 export function createMiniAppApproveMemberHandler(options: {
  allowedOrigins: readonly string[]
  botToken: string
--- a/apps/bot/src/miniapp-auth.test.ts
+++ b/apps/bot/src/miniapp-auth.test.ts
@@ -140,7 +140,37 @@ function onboardingRepository(): HouseholdConfigurationRepository {
            preferredLocale: locale
          }
        : null
-    }
+    },
+    getHouseholdBillingSettings: async (householdId) => ({
+      householdId,
+      rentAmountMinor: null,
+      rentCurrency: 'USD',
+      rentDueDay: 20,
+      rentWarningDay: 17,
+      utilitiesDueDay: 4,
+      utilitiesReminderDay: 3,
+      timezone: 'Asia/Tbilisi'
+    }),
+    updateHouseholdBillingSettings: async (input) => ({
+      householdId: input.householdId,
+      rentAmountMinor: input.rentAmountMinor ?? null,
+      rentCurrency: input.rentCurrency ?? 'USD',
+      rentDueDay: input.rentDueDay ?? 20,
+      rentWarningDay: input.rentWarningDay ?? 17,
+      utilitiesDueDay: input.utilitiesDueDay ?? 4,
+      utilitiesReminderDay: input.utilitiesReminderDay ?? 3,
+      timezone: input.timezone ?? 'Asia/Tbilisi'
+    }),
+    listHouseholdUtilityCategories: async () => [],
+    upsertHouseholdUtilityCategory: async (input) => ({
+      id: input.slug ?? 'utility-category-1',
+      householdId: input.householdId,
+      slug: input.slug ?? 'custom',
+      name: input.name,
+      sortOrder: input.sortOrder,
+      isActive: input.isActive
+    }),
+    promoteHouseholdAdmin: async () => null
  }
 }

--- a/apps/bot/src/miniapp-dashboard.test.ts
+++ b/apps/bot/src/miniapp-dashboard.test.ts
@@ -135,7 +135,37 @@ function onboardingRepository(): HouseholdConfigurationRepository {
      ...household,
      defaultLocale: locale
    }),
-    updateMemberPreferredLocale: async () => null
+    updateMemberPreferredLocale: async () => null,
+    getHouseholdBillingSettings: async (householdId) => ({
+      householdId,
+      rentAmountMinor: null,
+      rentCurrency: 'USD',
+      rentDueDay: 20,
+      rentWarningDay: 17,
+      utilitiesDueDay: 4,
+      utilitiesReminderDay: 3,
+      timezone: 'Asia/Tbilisi'
+    }),
+    updateHouseholdBillingSettings: async (input) => ({
+      householdId: input.householdId,
+      rentAmountMinor: input.rentAmountMinor ?? null,
+      rentCurrency: input.rentCurrency ?? 'USD',
+      rentDueDay: input.rentDueDay ?? 20,
+      rentWarningDay: input.rentWarningDay ?? 17,
+      utilitiesDueDay: input.utilitiesDueDay ?? 4,
+      utilitiesReminderDay: input.utilitiesReminderDay ?? 3,
+      timezone: input.timezone ?? 'Asia/Tbilisi'
+    }),
+    listHouseholdUtilityCategories: async () => [],
+    upsertHouseholdUtilityCategory: async (input) => ({
+      id: input.slug ?? 'utility-category-1',
+      householdId: input.householdId,
+      slug: input.slug ?? 'custom',
+      name: input.name,
+      sortOrder: input.sortOrder,
+      isActive: input.isActive
+    }),
+    promoteHouseholdAdmin: async () => null
  }
 }

--- a/apps/bot/src/miniapp-locale.test.ts
+++ b/apps/bot/src/miniapp-locale.test.ts
@@ -124,7 +124,37 @@ function repository(): HouseholdConfigurationRepository {
      }
      members.set(telegramUserId, next)
      return next
-    }
+    },
+    getHouseholdBillingSettings: async (householdId) => ({
+      householdId,
+      rentAmountMinor: null,
+      rentCurrency: 'USD',
+      rentDueDay: 20,
+      rentWarningDay: 17,
+      utilitiesDueDay: 4,
+      utilitiesReminderDay: 3,
+      timezone: 'Asia/Tbilisi'
+    }),
+    updateHouseholdBillingSettings: async (input) => ({
+      householdId: input.householdId,
+      rentAmountMinor: input.rentAmountMinor ?? null,
+      rentCurrency: input.rentCurrency ?? 'USD',
+      rentDueDay: input.rentDueDay ?? 20,
+      rentWarningDay: input.rentWarningDay ?? 17,
+      utilitiesDueDay: input.utilitiesDueDay ?? 4,
+      utilitiesReminderDay: input.utilitiesReminderDay ?? 3,
+      timezone: input.timezone ?? 'Asia/Tbilisi'
+    }),
+    listHouseholdUtilityCategories: async () => [],
+    upsertHouseholdUtilityCategory: async (input) => ({
+      id: input.slug ?? 'utility-category-1',
+      householdId: input.householdId,
+      slug: input.slug ?? 'custom',
+      name: input.name,
+      sortOrder: input.sortOrder,
+      isActive: input.isActive
+    }),
+    promoteHouseholdAdmin: async () => null
  }
 }

--- a/apps/bot/src/server.test.ts
+++ b/apps/bot/src/server.test.ts
@@ -34,6 +34,45 @@ describe('createBotWebhookServer', () => {
          }
        })
    },
+    miniAppSettings: {
+      handler: async () =>
+        new Response(
+          JSON.stringify({ ok: true, authorized: true, settings: {}, categories: [], members: [] }),
+          {
+            status: 200,
+            headers: {
+              'content-type': 'application/json; charset=utf-8'
+            }
+          }
+        )
+    },
+    miniAppUpdateSettings: {
+      handler: async () =>
+        new Response(JSON.stringify({ ok: true, authorized: true, settings: {} }), {
+          status: 200,
+          headers: {
+            'content-type': 'application/json; charset=utf-8'
+          }
+        })
+    },
+    miniAppUpsertUtilityCategory: {
+      handler: async () =>
+        new Response(JSON.stringify({ ok: true, authorized: true, category: {} }), {
+          status: 200,
+          headers: {
+            'content-type': 'application/json; charset=utf-8'
+          }
+        })
+    },
+    miniAppPromoteMember: {
+      handler: async () =>
+        new Response(JSON.stringify({ ok: true, authorized: true, member: {} }), {
+          status: 200,
+          headers: {
+            'content-type': 'application/json; charset=utf-8'
+          }
+        })
+    },
    miniAppApproveMember: {
      handler: async () =>
        new Response(JSON.stringify({ ok: true, authorized: true, member: {} }), {
@@ -154,6 +193,72 @@ describe('createBotWebhookServer', () => {
    })
  })

+  test('accepts mini app settings request', async () => {
+    const response = await server.fetch(
+      new Request('http://localhost/api/miniapp/admin/settings', {
+        method: 'POST',
+        body: JSON.stringify({ initData: 'payload' })
+      })
+    )
+
+    expect(response.status).toBe(200)
+    expect(await response.json()).toEqual({
+      ok: true,
+      authorized: true,
+      settings: {},
+      categories: [],
+      members: []
+    })
+  })
+
+  test('accepts mini app settings update request', async () => {
+    const response = await server.fetch(
+      new Request('http://localhost/api/miniapp/admin/settings/update', {
+        method: 'POST',
+        body: JSON.stringify({ initData: 'payload' })
+      })
+    )
+
+    expect(response.status).toBe(200)
+    expect(await response.json()).toEqual({
+      ok: true,
+      authorized: true,
+      settings: {}
+    })
+  })
+
+  test('accepts mini app utility category upsert request', async () => {
+    const response = await server.fetch(
+      new Request('http://localhost/api/miniapp/admin/utility-categories/upsert', {
+        method: 'POST',
+        body: JSON.stringify({ initData: 'payload' })
+      })
+    )
+
+    expect(response.status).toBe(200)
+    expect(await response.json()).toEqual({
+      ok: true,
+      authorized: true,
+      category: {}
+    })
+  })
+
+  test('accepts mini app promote member request', async () => {
+    const response = await server.fetch(
+      new Request('http://localhost/api/miniapp/admin/members/promote', {
+        method: 'POST',
+        body: JSON.stringify({ initData: 'payload' })
+      })
+    )
+
+    expect(response.status).toBe(200)
+    expect(await response.json()).toEqual({
+      ok: true,
+      authorized: true,
+      member: {}
+    })
+  })
+
  test('accepts mini app approve member request', async () => {
    const response = await server.fetch(
      new Request('http://localhost/api/miniapp/admin/approve-member', {
--- a/apps/bot/src/server.ts
+++ b/apps/bot/src/server.ts
@@ -32,6 +32,30 @@ export interface BotWebhookServerOptions {
        handler: (request: Request) => Promise<Response>
      }
    | undefined
+  miniAppSettings?:
+    | {
+        path?: string
+        handler: (request: Request) => Promise<Response>
+      }
+    | undefined
+  miniAppUpdateSettings?:
+    | {
+        path?: string
+        handler: (request: Request) => Promise<Response>
+      }
+    | undefined
+  miniAppUpsertUtilityCategory?:
+    | {
+        path?: string
+        handler: (request: Request) => Promise<Response>
+      }
+    | undefined
+  miniAppPromoteMember?:
+    | {
+        path?: string
+        handler: (request: Request) => Promise<Response>
+      }
+    | undefined
  miniAppLocalePreference?:
    | {
        path?: string
@@ -75,6 +99,13 @@ export function createBotWebhookServer(options: BotWebhookServerOptions): {
    options.miniAppPendingMembers?.path ?? '/api/miniapp/admin/pending-members'
  const miniAppApproveMemberPath =
    options.miniAppApproveMember?.path ?? '/api/miniapp/admin/approve-member'
+  const miniAppSettingsPath = options.miniAppSettings?.path ?? '/api/miniapp/admin/settings'
+  const miniAppUpdateSettingsPath =
+    options.miniAppUpdateSettings?.path ?? '/api/miniapp/admin/settings/update'
+  const miniAppUpsertUtilityCategoryPath =
+    options.miniAppUpsertUtilityCategory?.path ?? '/api/miniapp/admin/utility-categories/upsert'
+  const miniAppPromoteMemberPath =
+    options.miniAppPromoteMember?.path ?? '/api/miniapp/admin/members/promote'
  const miniAppLocalePreferencePath =
    options.miniAppLocalePreference?.path ?? '/api/miniapp/preferences/locale'
  const schedulerPathPrefix = options.scheduler
@@ -109,6 +140,25 @@ export function createBotWebhookServer(options: BotWebhookServerOptions): {
        return await options.miniAppApproveMember.handler(request)
      }

+      if (options.miniAppSettings && url.pathname === miniAppSettingsPath) {
+        return await options.miniAppSettings.handler(request)
+      }
+
+      if (options.miniAppUpdateSettings && url.pathname === miniAppUpdateSettingsPath) {
+        return await options.miniAppUpdateSettings.handler(request)
+      }
+
+      if (
+        options.miniAppUpsertUtilityCategory &&
+        url.pathname === miniAppUpsertUtilityCategoryPath
+      ) {
+        return await options.miniAppUpsertUtilityCategory.handler(request)
+      }
+
+      if (options.miniAppPromoteMember && url.pathname === miniAppPromoteMemberPath) {
+        return await options.miniAppPromoteMember.handler(request)
+      }
+
      if (options.miniAppLocalePreference && url.pathname === miniAppLocalePreferencePath) {
        return await options.miniAppLocalePreference.handler(request)
      }
--- a/apps/miniapp/src/App.tsx
+++ b/apps/miniapp/src/App.tsx
@@ -3,11 +3,16 @@ import { Match, Switch, createMemo, createSignal, onMount, type JSX } from 'soli
 import { dictionary, type Locale } from './i18n'
 import {
  approveMiniAppPendingMember,
+  fetchMiniAppAdminSettings,
  fetchMiniAppDashboard,
  fetchMiniAppPendingMembers,
  fetchMiniAppSession,
  joinMiniAppHousehold,
+  promoteMiniAppMember,
+  type MiniAppAdminSettingsPayload,
  updateMiniAppLocalePreference,
+  updateMiniAppBillingSettings,
+  upsertMiniAppUtilityCategory,
  type MiniAppDashboard,
  type MiniAppPendingMember
 } from './miniapp-api'
@@ -123,10 +128,24 @@ function App() {
  const [activeNav, setActiveNav] = createSignal<NavigationKey>('home')
  const [dashboard, setDashboard] = createSignal<MiniAppDashboard | null>(null)
  const [pendingMembers, setPendingMembers] = createSignal<readonly MiniAppPendingMember[]>([])
+  const [adminSettings, setAdminSettings] = createSignal<MiniAppAdminSettingsPayload | null>(null)
  const [joining, setJoining] = createSignal(false)
  const [approvingTelegramUserId, setApprovingTelegramUserId] = createSignal<string | null>(null)
+  const [promotingMemberId, setPromotingMemberId] = createSignal<string | null>(null)
  const [savingMemberLocale, setSavingMemberLocale] = createSignal(false)
  const [savingHouseholdLocale, setSavingHouseholdLocale] = createSignal(false)
+  const [savingBillingSettings, setSavingBillingSettings] = createSignal(false)
+  const [savingCategorySlug, setSavingCategorySlug] = createSignal<string | null>(null)
+  const [billingForm, setBillingForm] = createSignal({
+    rentAmountMajor: '',
+    rentCurrency: 'USD' as 'USD' | 'GEL',
+    rentDueDay: 20,
+    rentWarningDay: 17,
+    utilitiesDueDay: 4,
+    utilitiesReminderDay: 3,
+    timezone: 'Asia/Tbilisi'
+  })
+  const [newCategoryName, setNewCategoryName] = createSignal('')

  const copy = createMemo(() => dictionary[locale()])
  const onboardingSession = createMemo(() => {
@@ -167,6 +186,30 @@ function App() {
    }
  }

+  async function loadAdminSettings(initData: string) {
+    try {
+      const payload = await fetchMiniAppAdminSettings(initData)
+      setAdminSettings(payload)
+      setBillingForm({
+        rentAmountMajor: payload.settings.rentAmountMinor
+          ? (Number(payload.settings.rentAmountMinor) / 100).toFixed(2)
+          : '',
+        rentCurrency: payload.settings.rentCurrency,
+        rentDueDay: payload.settings.rentDueDay,
+        rentWarningDay: payload.settings.rentWarningDay,
+        utilitiesDueDay: payload.settings.utilitiesDueDay,
+        utilitiesReminderDay: payload.settings.utilitiesReminderDay,
+        timezone: payload.settings.timezone
+      })
+    } catch (error) {
+      if (import.meta.env.DEV) {
+        console.warn('Failed to load mini app admin settings', error)
+      }
+
+      setAdminSettings(null)
+    }
+  }
+
  async function bootstrap() {
    const fallbackLocale = detectLocale()
    setLocale(fallbackLocale)
@@ -223,6 +266,7 @@ function App() {
      await loadDashboard(initData)
      if (payload.member.isAdmin) {
        await loadPendingMembers(initData)
+        await loadAdminSettings(initData)
      }
    } catch {
      if (import.meta.env.DEV) {
@@ -315,6 +359,7 @@ function App() {
        await loadDashboard(initData)
        if (payload.member.isAdmin) {
          await loadPendingMembers(initData)
+          await loadAdminSettings(initData)
        }
        return
      }
@@ -430,6 +475,93 @@ function App() {
    }
  }

+  async function handleSaveBillingSettings() {
+    const initData = webApp?.initData?.trim()
+    const currentReady = readySession()
+    if (!initData || currentReady?.mode !== 'live' || !currentReady.member.isAdmin) {
+      return
+    }
+
+    setSavingBillingSettings(true)
+
+    try {
+      const settings = await updateMiniAppBillingSettings(initData, billingForm())
+      setAdminSettings((current) =>
+        current
+          ? {
+              ...current,
+              settings
+            }
+          : current
+      )
+    } finally {
+      setSavingBillingSettings(false)
+    }
+  }
+
+  async function handleSaveUtilityCategory(input: {
+    slug?: string
+    name: string
+    sortOrder: number
+    isActive: boolean
+  }) {
+    const initData = webApp?.initData?.trim()
+    const currentReady = readySession()
+    if (!initData || currentReady?.mode !== 'live' || !currentReady.member.isAdmin) {
+      return
+    }
+
+    setSavingCategorySlug(input.slug ?? '__new__')
+
+    try {
+      const category = await upsertMiniAppUtilityCategory(initData, input)
+      setAdminSettings((current) => {
+        if (!current) {
+          return current
+        }
+
+        const categories = current.categories.some((item) => item.slug === category.slug)
+          ? current.categories.map((item) => (item.slug === category.slug ? category : item))
+          : [...current.categories, category]
+
+        return {
+          ...current,
+          categories: [...categories].sort((left, right) => left.sortOrder - right.sortOrder)
+        }
+      })
+
+      if (!input.slug) {
+        setNewCategoryName('')
+      }
+    } finally {
+      setSavingCategorySlug(null)
+    }
+  }
+
+  async function handlePromoteMember(memberId: string) {
+    const initData = webApp?.initData?.trim()
+    const currentReady = readySession()
+    if (!initData || currentReady?.mode !== 'live' || !currentReady.member.isAdmin) {
+      return
+    }
+
+    setPromotingMemberId(memberId)
+
+    try {
+      const member = await promoteMiniAppMember(initData, memberId)
+      setAdminSettings((current) =>
+        current
+          ? {
+              ...current,
+              members: current.members.map((item) => (item.id === member.id ? member : item))
+            }
+          : current
+      )
+    } finally {
+      setPromotingMemberId(null)
+    }
+  }
+
  const renderPanel = () => {
    switch (activeNav()) {
      case 'balances':
@@ -493,6 +625,120 @@ function App() {
              </header>
              <p>{copy().householdSettingsBody}</p>
            </article>
+            <article class="balance-item">
+              <header>
+                <strong>{copy().billingSettingsTitle}</strong>
+              </header>
+              <div class="settings-grid">
+                <label class="settings-field">
+                  <span>{copy().rentAmount}</span>
+                  <input
+                    value={billingForm().rentAmountMajor}
+                    onInput={(event) =>
+                      setBillingForm((current) => ({
+                        ...current,
+                        rentAmountMajor: event.currentTarget.value
+                      }))
+                    }
+                  />
+                </label>
+                <label class="settings-field">
+                  <span>{copy().shareRent}</span>
+                  <select
+                    value={billingForm().rentCurrency}
+                    onChange={(event) =>
+                      setBillingForm((current) => ({
+                        ...current,
+                        rentCurrency: event.currentTarget.value as 'USD' | 'GEL'
+                      }))
+                    }
+                  >
+                    <option value="USD">USD</option>
+                    <option value="GEL">GEL</option>
+                  </select>
+                </label>
+                <label class="settings-field">
+                  <span>{copy().rentDueDay}</span>
+                  <input
+                    type="number"
+                    min="1"
+                    max="31"
+                    value={String(billingForm().rentDueDay)}
+                    onInput={(event) =>
+                      setBillingForm((current) => ({
+                        ...current,
+                        rentDueDay: Number(event.currentTarget.value)
+                      }))
+                    }
+                  />
+                </label>
+                <label class="settings-field">
+                  <span>{copy().rentWarningDay}</span>
+                  <input
+                    type="number"
+                    min="1"
+                    max="31"
+                    value={String(billingForm().rentWarningDay)}
+                    onInput={(event) =>
+                      setBillingForm((current) => ({
+                        ...current,
+                        rentWarningDay: Number(event.currentTarget.value)
+                      }))
+                    }
+                  />
+                </label>
+                <label class="settings-field">
+                  <span>{copy().utilitiesDueDay}</span>
+                  <input
+                    type="number"
+                    min="1"
+                    max="31"
+                    value={String(billingForm().utilitiesDueDay)}
+                    onInput={(event) =>
+                      setBillingForm((current) => ({
+                        ...current,
+                        utilitiesDueDay: Number(event.currentTarget.value)
+                      }))
+                    }
+                  />
+                </label>
+                <label class="settings-field">
+                  <span>{copy().utilitiesReminderDay}</span>
+                  <input
+                    type="number"
+                    min="1"
+                    max="31"
+                    value={String(billingForm().utilitiesReminderDay)}
+                    onInput={(event) =>
+                      setBillingForm((current) => ({
+                        ...current,
+                        utilitiesReminderDay: Number(event.currentTarget.value)
+                      }))
+                    }
+                  />
+                </label>
+                <label class="settings-field settings-field--wide">
+                  <span>{copy().timezone}</span>
+                  <input
+                    value={billingForm().timezone}
+                    onInput={(event) =>
+                      setBillingForm((current) => ({
+                        ...current,
+                        timezone: event.currentTarget.value
+                      }))
+                    }
+                  />
+                </label>
+              </div>
+              <button
+                class="ghost-button"
+                type="button"
+                disabled={savingBillingSettings()}
+                onClick={() => void handleSaveBillingSettings()}
+              >
+                {savingBillingSettings() ? copy().savingSettings : copy().saveSettingsAction}
+              </button>
+            </article>
            <article class="balance-item">
              <header>
                <strong>{copy().householdLanguage}</strong>
@@ -521,6 +767,149 @@ function App() {
                </button>
              </div>
            </article>
+            <article class="balance-item">
+              <header>
+                <strong>{copy().utilityCategoriesTitle}</strong>
+              </header>
+              <p>{copy().utilityCategoriesBody}</p>
+              <div class="balance-list">
+                {adminSettings()?.categories.map((category) => (
+                  <article class="ledger-item">
+                    <header>
+                      <strong>{category.name}</strong>
+                      <span>{category.isActive ? 'ON' : 'OFF'}</span>
+                    </header>
+                    <div class="settings-grid">
+                      <label class="settings-field settings-field--wide">
+                        <span>{copy().utilityCategoryName}</span>
+                        <input
+                          value={category.name}
+                          onInput={(event) =>
+                            setAdminSettings((current) =>
+                              current
+                                ? {
+                                    ...current,
+                                    categories: current.categories.map((item) =>
+                                      item.slug === category.slug
+                                        ? {
+                                            ...item,
+                                            name: event.currentTarget.value
+                                          }
+                                        : item
+                                    )
+                                  }
+                                : current
+                            )
+                          }
+                        />
+                      </label>
+                      <label class="settings-field">
+                        <span>{copy().utilityCategoryActive}</span>
+                        <select
+                          value={category.isActive ? 'true' : 'false'}
+                          onChange={(event) =>
+                            setAdminSettings((current) =>
+                              current
+                                ? {
+                                    ...current,
+                                    categories: current.categories.map((item) =>
+                                      item.slug === category.slug
+                                        ? {
+                                            ...item,
+                                            isActive: event.currentTarget.value === 'true'
+                                          }
+                                        : item
+                                    )
+                                  }
+                                : current
+                            )
+                          }
+                        >
+                          <option value="true">ON</option>
+                          <option value="false">OFF</option>
+                        </select>
+                      </label>
+                    </div>
+                    <button
+                      class="ghost-button"
+                      type="button"
+                      disabled={savingCategorySlug() === category.slug}
+                      onClick={() =>
+                        void handleSaveUtilityCategory({
+                          slug: category.slug,
+                          name:
+                            adminSettings()?.categories.find((item) => item.slug === category.slug)
+                              ?.name ?? category.name,
+                          sortOrder: category.sortOrder,
+                          isActive:
+                            adminSettings()?.categories.find((item) => item.slug === category.slug)
+                              ?.isActive ?? category.isActive
+                        })
+                      }
+                    >
+                      {savingCategorySlug() === category.slug
+                        ? copy().savingCategory
+                        : copy().saveCategoryAction}
+                    </button>
+                  </article>
+                ))}
+                <article class="ledger-item">
+                  <label class="settings-field settings-field--wide">
+                    <span>{copy().utilityCategoryName}</span>
+                    <input
+                      value={newCategoryName()}
+                      onInput={(event) => setNewCategoryName(event.currentTarget.value)}
+                    />
+                  </label>
+                  <button
+                    class="ghost-button"
+                    type="button"
+                    disabled={
+                      newCategoryName().trim().length === 0 || savingCategorySlug() === '__new__'
+                    }
+                    onClick={() =>
+                      void handleSaveUtilityCategory({
+                        name: newCategoryName(),
+                        sortOrder: adminSettings()?.categories.length ?? 0,
+                        isActive: true
+                      })
+                    }
+                  >
+                    {savingCategorySlug() === '__new__'
+                      ? copy().savingCategory
+                      : copy().addCategoryAction}
+                  </button>
+                </article>
+              </div>
+            </article>
+            <article class="balance-item">
+              <header>
+                <strong>{copy().adminsTitle}</strong>
+              </header>
+              <p>{copy().adminsBody}</p>
+              <div class="balance-list">
+                {adminSettings()?.members.map((member) => (
+                  <article class="ledger-item">
+                    <header>
+                      <strong>{member.displayName}</strong>
+                      <span>{member.isAdmin ? copy().adminTag : copy().residentTag}</span>
+                    </header>
+                    {!member.isAdmin ? (
+                      <button
+                        class="ghost-button"
+                        type="button"
+                        disabled={promotingMemberId() === member.id}
+                        onClick={() => void handlePromoteMember(member.id)}
+                      >
+                        {promotingMemberId() === member.id
+                          ? copy().promotingAdmin
+                          : copy().promoteAdminAction}
+                      </button>
+                    ) : null}
+                  </article>
+                ))}
+              </div>
+            </article>
            <article class="balance-item">
              <header>
                <strong>{copy().pendingMembersTitle}</strong>
--- a/apps/miniapp/src/i18n.ts
+++ b/apps/miniapp/src/i18n.ts
@@ -54,6 +54,26 @@ export const dictionary = {
    latestActivityEmpty: 'Recent utility and purchase entries will appear here.',
    householdSettingsTitle: 'Household settings',
    householdSettingsBody: 'Control household defaults and approve roommates who requested access.',
+    billingSettingsTitle: 'Billing settings',
+    rentAmount: 'Rent amount',
+    rentDueDay: 'Rent due day',
+    rentWarningDay: 'Rent warning day',
+    utilitiesDueDay: 'Utilities due day',
+    utilitiesReminderDay: 'Utilities reminder day',
+    timezone: 'Timezone',
+    saveSettingsAction: 'Save settings',
+    savingSettings: 'Saving settings…',
+    utilityCategoriesTitle: 'Utility categories',
+    utilityCategoriesBody: 'Manage the categories admins use for monthly utility entry.',
+    utilityCategoryName: 'Category name',
+    utilityCategoryActive: 'Active',
+    addCategoryAction: 'Add category',
+    saveCategoryAction: 'Save category',
+    savingCategory: 'Saving…',
+    adminsTitle: 'Admins',
+    adminsBody: 'Promote trusted household members so they can manage billing and approvals.',
+    promoteAdminAction: 'Promote to admin',
+    promotingAdmin: 'Promoting…',
    residentHouseTitle: 'Household access',
    residentHouseBody:
      'Your admins manage household settings and approvals here. You can still switch your own language above.',
@@ -120,6 +140,28 @@ export const dictionary = {
    latestActivityEmpty: 'Здесь появятся последние коммунальные платежи и покупки.',
    householdSettingsTitle: 'Настройки household',
    householdSettingsBody: 'Здесь можно менять язык household и подтверждать новых соседей.',
+    billingSettingsTitle: 'Настройки биллинга',
+    rentAmount: 'Сумма аренды',
+    rentDueDay: 'День оплаты аренды',
+    rentWarningDay: 'День напоминания по аренде',
+    utilitiesDueDay: 'День оплаты коммуналки',
+    utilitiesReminderDay: 'День напоминания по коммуналке',
+    timezone: 'Часовой пояс',
+    saveSettingsAction: 'Сохранить настройки',
+    savingSettings: 'Сохраняем настройки…',
+    utilityCategoriesTitle: 'Категории коммуналки',
+    utilityCategoriesBody:
+      'Управляй категориями, которые админы используют для ежемесячного ввода коммунальных счетов.',
+    utilityCategoryName: 'Название категории',
+    utilityCategoryActive: 'Активна',
+    addCategoryAction: 'Добавить категорию',
+    saveCategoryAction: 'Сохранить категорию',
+    savingCategory: 'Сохраняем…',
+    adminsTitle: 'Админы',
+    adminsBody:
+      'Повышай доверенных участников, чтобы они могли управлять биллингом и подтверждениями.',
+    promoteAdminAction: 'Сделать админом',
+    promotingAdmin: 'Повышаем…',
    residentHouseTitle: 'Доступ к household',
    residentHouseBody:
      'Настройки household и подтверждение заявок управляются админами. Свой язык можно менять переключателем выше.',
--- a/apps/miniapp/src/index.css
+++ b/apps/miniapp/src/index.css
@@ -283,6 +283,37 @@ button {
  font-size: clamp(1.2rem, 4vw, 1.7rem);
 }

+.settings-grid {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 12px;
+  margin-top: 12px;
+}
+
+.settings-field {
+  display: grid;
+  gap: 6px;
+}
+
+.settings-field span {
+  color: #c6c2bb;
+  font-size: 0.82rem;
+}
+
+.settings-field input,
+.settings-field select {
+  width: 100%;
+  border: 1px solid rgb(255 255 255 / 0.12);
+  border-radius: 14px;
+  padding: 12px 14px;
+  background: rgb(255 255 255 / 0.04);
+  color: inherit;
+}
+
+.settings-field--wide {
+  grid-column: 1 / -1;
+}
+
 .panel--wide {
  min-height: 170px;
 }
@@ -302,6 +333,10 @@ button {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

+  .settings-grid {
+    grid-template-columns: repeat(3, minmax(0, 1fr));
+  }
+
  .panel--wide {
    grid-column: 1 / -1;
  }
--- a/apps/miniapp/src/miniapp-api.ts
+++ b/apps/miniapp/src/miniapp-api.ts
@@ -34,6 +34,32 @@ export interface MiniAppPendingMember {
  languageCode: string | null
 }

+export interface MiniAppMember {
+  id: string
+  displayName: string
+  isAdmin: boolean
+}
+
+export interface MiniAppBillingSettings {
+  householdId: string
+  rentAmountMinor: string | null
+  rentCurrency: 'USD' | 'GEL'
+  rentDueDay: number
+  rentWarningDay: number
+  utilitiesDueDay: number
+  utilitiesReminderDay: number
+  timezone: string
+}
+
+export interface MiniAppUtilityCategory {
+  id: string
+  householdId: string
+  slug: string
+  name: string
+  sortOrder: number
+  isActive: boolean
+}
+
 export interface MiniAppDashboard {
  period: string
  currency: 'USD' | 'GEL'
@@ -57,6 +83,12 @@ export interface MiniAppDashboard {
  }[]
 }

+export interface MiniAppAdminSettingsPayload {
+  settings: MiniAppBillingSettings
+  categories: readonly MiniAppUtilityCategory[]
+  members: readonly MiniAppMember[]
+}
+
 function apiBaseUrl(): string {
  const runtimeConfigured = runtimeBotApiUrl()
  if (runtimeConfigured) {
@@ -260,3 +292,142 @@ export async function updateMiniAppLocalePreference(

  return payload.locale
 }
+
+export async function fetchMiniAppAdminSettings(
+  initData: string
+): Promise<MiniAppAdminSettingsPayload> {
+  const response = await fetch(`${apiBaseUrl()}/api/miniapp/admin/settings`, {
+    method: 'POST',
+    headers: {
+      'content-type': 'application/json'
+    },
+    body: JSON.stringify({
+      initData
+    })
+  })
+
+  const payload = (await response.json()) as {
+    ok: boolean
+    authorized?: boolean
+    settings?: MiniAppBillingSettings
+    categories?: MiniAppUtilityCategory[]
+    members?: MiniAppMember[]
+    error?: string
+  }
+
+  if (
+    !response.ok ||
+    !payload.authorized ||
+    !payload.settings ||
+    !payload.categories ||
+    !payload.members
+  ) {
+    throw new Error(payload.error ?? 'Failed to load admin settings')
+  }
+
+  return {
+    settings: payload.settings,
+    categories: payload.categories,
+    members: payload.members
+  }
+}
+
+export async function updateMiniAppBillingSettings(
+  initData: string,
+  input: {
+    rentAmountMajor?: string
+    rentCurrency: 'USD' | 'GEL'
+    rentDueDay: number
+    rentWarningDay: number
+    utilitiesDueDay: number
+    utilitiesReminderDay: number
+    timezone: string
+  }
+): Promise<MiniAppBillingSettings> {
+  const response = await fetch(`${apiBaseUrl()}/api/miniapp/admin/settings/update`, {
+    method: 'POST',
+    headers: {
+      'content-type': 'application/json'
+    },
+    body: JSON.stringify({
+      initData,
+      ...input
+    })
+  })
+
+  const payload = (await response.json()) as {
+    ok: boolean
+    authorized?: boolean
+    settings?: MiniAppBillingSettings
+    error?: string
+  }
+
+  if (!response.ok || !payload.authorized || !payload.settings) {
+    throw new Error(payload.error ?? 'Failed to update billing settings')
+  }
+
+  return payload.settings
+}
+
+export async function upsertMiniAppUtilityCategory(
+  initData: string,
+  input: {
+    slug?: string
+    name: string
+    sortOrder: number
+    isActive: boolean
+  }
+): Promise<MiniAppUtilityCategory> {
+  const response = await fetch(`${apiBaseUrl()}/api/miniapp/admin/utility-categories/upsert`, {
+    method: 'POST',
+    headers: {
+      'content-type': 'application/json'
+    },
+    body: JSON.stringify({
+      initData,
+      ...input
+    })
+  })
+
+  const payload = (await response.json()) as {
+    ok: boolean
+    authorized?: boolean
+    category?: MiniAppUtilityCategory
+    error?: string
+  }
+
+  if (!response.ok || !payload.authorized || !payload.category) {
+    throw new Error(payload.error ?? 'Failed to save utility category')
+  }
+
+  return payload.category
+}
+
+export async function promoteMiniAppMember(
+  initData: string,
+  memberId: string
+): Promise<MiniAppMember> {
+  const response = await fetch(`${apiBaseUrl()}/api/miniapp/admin/members/promote`, {
+    method: 'POST',
+    headers: {
+      'content-type': 'application/json'
+    },
+    body: JSON.stringify({
+      initData,
+      memberId
+    })
+  })
+
+  const payload = (await response.json()) as {
+    ok: boolean
+    authorized?: boolean
+    member?: MiniAppMember
+    error?: string
+  }
+
+  if (!response.ok || !payload.authorized || !payload.member) {
+    throw new Error(payload.error ?? 'Failed to promote member')
+  }
+
+  return payload.member
+}