diff --git a/database/migrations/067_seed_countries_europe_middle_east_far_east.sql b/database/migrations/067_seed_countries_europe_middle_east_far_east.sql
new file mode 100644
index 0000000..010116e
--- /dev/null
+++ b/database/migrations/067_seed_countries_europe_middle_east_far_east.sql
@@ -0,0 +1,210 @@
+-- Seed European, Middle Eastern, and Far Eastern countries + major cities.
+-- Skips rows when slug already exists (Iran/Iraq/Turkey/UAE from 053 remain).
+
+INSERT INTO cities (parent_id, level, name_fa, name_en, landline_code, slug, sort_order)
+SELECT NULL, 'country', v.name_fa, v.name_en, v.landline_code, v.slug, v.sort_order
+FROM (
+  VALUES
+    -- Middle East (beyond 053)
+    ('عربستان سعودی', 'Saudi Arabia', '966', 'saudi-arabia', 5),
+    ('قطر', 'Qatar', '974', 'qatar', 6),
+    ('کویت', 'Kuwait', '965', 'kuwait', 7),
+    ('بحرین', 'Bahrain', '973', 'bahrain', 8),
+    ('عمان', 'Oman', '968', 'oman', 9),
+    ('اردن', 'Jordan', '962', 'jordan', 10),
+    ('لبنان', 'Lebanon', '961', 'lebanon', 11),
+    ('سوریه', 'Syria', '963', 'syria', 12),
+    ('فلسطین', 'Palestine', '970', 'palestine', 13),
+    ('اسرائیل', 'Israel', '972', 'israel', 14),
+    ('یمن', 'Yemen', '967', 'yemen', 15),
+    ('مصر', 'Egypt', '20', 'egypt', 16),
+    ('افغانستان', 'Afghanistan', '93', 'afghanistan', 17),
+    ('پاکستان', 'Pakistan', '92', 'pakistan', 18),
+    -- Europe
+    ('آلبانی', 'Albania', '355', 'albania', 100),
+    ('آندورا', 'Andorra', '376', 'andorra', 101),
+    ('اتریش', 'Austria', '43', 'austria', 102),
+    ('بلاروس', 'Belarus', '375', 'belarus', 103),
+    ('بلژیک', 'Belgium', '32', 'belgium', 104),
+    ('بوسنی و هرزگوین', 'Bosnia and Herzegovina', '387', 'bosnia-herzegovina', 105),
+    ('بلغارستان', 'Bulgaria', '359', 'bulgaria', 106),
+    ('کرواسی', 'Croatia', '385', 'croatia', 107),
+    ('قبرس', 'Cyprus', '357', 'cyprus', 108),
+    ('جمهوری چک', 'Czech Republic', '420', 'czech-republic', 109),
+    ('دانمارک', 'Denmark', '45', 'denmark', 110),
+    ('استونی', 'Estonia', '372', 'estonia', 111),
+    ('فنلاند', 'Finland', '358', 'finland', 112),
+    ('فرانسه', 'France', '33', 'france', 113),
+    ('آلمان', 'Germany', '49', 'germany', 114),
+    ('یونان', 'Greece', '30', 'greece', 115),
+    ('مجارستان', 'Hungary', '36', 'hungary', 116),
+    ('ایسلند', 'Iceland', '354', 'iceland', 117),
+    ('ایرلند', 'Ireland', '353', 'ireland', 118),
+    ('ایتالیا', 'Italy', '39', 'italy', 119),
+    ('کوزوو', 'Kosovo', '383', 'kosovo', 120),
+    ('لتونی', 'Latvia', '371', 'latvia', 121),
+    ('لیتوانی', 'Lithuania', '370', 'lithuania', 122),
+    ('لوکزامبورگ', 'Luxembourg', '352', 'luxembourg', 123),
+    ('مالت', 'Malta', '356', 'malta', 124),
+    ('مولداوی', 'Moldova', '373', 'moldova', 125),
+    ('موناکو', 'Monaco', '377', 'monaco', 126),
+    ('مونته‌نگرو', 'Montenegro', '382', 'montenegro', 127),
+    ('هلند', 'Netherlands', '31', 'netherlands', 128),
+    ('مقدونیه شمالی', 'North Macedonia', '389', 'north-macedonia', 129),
+    ('نروژ', 'Norway', '47', 'norway', 130),
+    ('لهستان', 'Poland', '48', 'poland', 131),
+    ('پرتغال', 'Portugal', '351', 'portugal', 132),
+    ('رومانی', 'Romania', '40', 'romania', 133),
+    ('روسیه', 'Russia', '7', 'russia', 134),
+    ('سان مارینو', 'San Marino', '378', 'san-marino', 135),
+    ('صربستان', 'Serbia', '381', 'serbia', 136),
+    ('اسلواکی', 'Slovakia', '421', 'slovakia', 137),
+    ('اسلوونی', 'Slovenia', '386', 'slovenia', 138),
+    ('اسپانیا', 'Spain', '34', 'spain', 139),
+    ('سوئد', 'Sweden', '46', 'sweden', 140),
+    ('سوئیس', 'Switzerland', '41', 'switzerland', 141),
+    ('اوکراین', 'Ukraine', '380', 'ukraine', 142),
+    ('بریتانیا', 'United Kingdom', '44', 'united-kingdom', 143),
+    -- Far East
+    ('چین', 'China', '86', 'china', 200),
+    ('ژاپن', 'Japan', '81', 'japan', 201),
+    ('کره جنوبی', 'South Korea', '82', 'south-korea', 202),
+    ('تایوان', 'Taiwan', '886', 'taiwan', 203),
+    ('هنگ‌کنگ', 'Hong Kong', '852', 'hong-kong', 204),
+    ('ماکائو', 'Macau', '853', 'macau', 205),
+    ('مغولستان', 'Mongolia', '976', 'mongolia', 206),
+    ('کره شمالی', 'North Korea', '850', 'north-korea', 207),
+    ('سنگاپور', 'Singapore', '65', 'singapore', 208),
+    ('مالزی', 'Malaysia', '60', 'malaysia', 209),
+    ('تایلند', 'Thailand', '66', 'thailand', 210),
+    ('ویتنام', 'Vietnam', '84', 'vietnam', 211),
+    ('اندونزی', 'Indonesia', '62', 'indonesia', 212),
+    ('فیلیپین', 'Philippines', '63', 'philippines', 213),
+    ('هند', 'India', '91', 'india', 214),
+    ('بنگلادش', 'Bangladesh', '880', 'bangladesh', 215),
+    ('سری‌لانکا', 'Sri Lanka', '94', 'sri-lanka', 216),
+    ('نپال', 'Nepal', '977', 'nepal', 217),
+    ('میانمار', 'Myanmar', '95', 'myanmar', 218),
+    ('کامبوج', 'Cambodia', '855', 'cambodia', 219),
+    ('لائوس', 'Laos', '856', 'laos', 220),
+    ('برونئی', 'Brunei', '673', 'brunei', 221)
+) AS v(name_fa, name_en, landline_code, slug, sort_order)
+WHERE NOT EXISTS (
+  SELECT 1 FROM cities c WHERE c.slug = v.slug
+);
+
+INSERT INTO cities (parent_id, level, name_fa, name_en, landline_code, slug, sort_order)
+SELECT c.id, 'city', v.name_fa, v.name_en, v.landline_code, v.slug, v.sort_order
+FROM cities c
+JOIN (
+  VALUES
+    -- Middle East
+    ('saudi-arabia', 'ریاض', 'Riyadh', '11', 'riyadh', 1),
+    ('saudi-arabia', 'جده', 'Jeddah', '12', 'jeddah', 2),
+    ('saudi-arabia', 'مکه', 'Mecca', '12', 'mecca', 3),
+    ('qatar', 'دوحه', 'Doha', '4', 'doha', 1),
+    ('kuwait', 'کویت', 'Kuwait City', '2', 'kuwait-city', 1),
+    ('bahrain', 'منامه', 'Manama', '17', 'manama', 1),
+    ('oman', 'مسقط', 'Muscat', '24', 'muscat', 1),
+    ('jordan', 'امان', 'Amman', '6', 'amman', 1),
+    ('lebanon', 'بیروت', 'Beirut', '1', 'beirut', 1),
+    ('syria', 'دمشق', 'Damascus', '11', 'damascus', 1),
+    ('palestine', 'رام‌الله', 'Ramallah', '2', 'ramallah', 1),
+    ('israel', 'تل‌آویو', 'Tel Aviv', '3', 'tel-aviv', 1),
+    ('israel', 'اورشلیم', 'Jerusalem', '2', 'jerusalem', 2),
+    ('yemen', 'صنعا', 'Sanaa', '1', 'sanaa', 1),
+    ('egypt', 'قاهره', 'Cairo', '2', 'cairo', 1),
+    ('egypt', 'اسکندریه', 'Alexandria', '3', 'alexandria', 2),
+    ('afghanistan', 'کابل', 'Kabul', '20', 'kabul', 1),
+    ('pakistan', 'اسلام‌آباد', 'Islamabad', '51', 'islamabad', 1),
+    ('pakistan', 'کراچی', 'Karachi', '21', 'karachi', 2),
+    ('pakistan', 'لاهور', 'Lahore', '42', 'lahore', 3),
+    -- Europe
+    ('albania', 'تیرانا', 'Tirana', '4', 'tirana', 1),
+    ('andorra', 'آندورا لا ولا', 'Andorra la Vella', '7', 'andorra-la-vella', 1),
+    ('austria', 'وین', 'Vienna', '1', 'vienna', 1),
+    ('belarus', 'مینسک', 'Minsk', '17', 'minsk', 1),
+    ('belgium', 'بروکسل', 'Brussels', '2', 'brussels', 1),
+    ('bosnia-herzegovina', 'Sarajevo', 'Sarajevo', '33', 'sarajevo', 1),
+    ('bulgaria', 'صوفیه', 'Sofia', '2', 'sofia', 1),
+    ('croatia', 'Zagreb', 'Zagreb', '1', 'zagreb', 1),
+    ('cyprus', 'نیکوزیا', 'Nicosia', '22', 'nicosia', 1),
+    ('czech-republic', 'پراگ', 'Prague', '2', 'prague', 1),
+    ('denmark', 'Copenhagen', 'Copenhagen', '3', 'copenhagen', 1),
+    ('estonia', 'تالین', 'Tallinn', '6', 'tallinn', 1),
+    ('finland', 'Helsinki', 'Helsinki', '9', 'helsinki', 1),
+    ('france', 'پاریس', 'Paris', '1', 'paris', 1),
+    ('france', 'لیون', 'Lyon', '4', 'lyon', 2),
+    ('germany', 'Berlin', 'Berlin', '30', 'berlin', 1),
+    ('germany', 'Munich', 'Munich', '89', 'munich', 2),
+    ('greece', 'Athens', 'Athens', '21', 'athens', 1),
+    ('hungary', 'Budapest', 'Budapest', '1', 'budapest', 1),
+    ('iceland', 'reykjavik', 'Reykjavik', '5', 'reykjavik', 1),
+    ('ireland', 'Dublin', 'Dublin', '1', 'dublin', 1),
+    ('italy', 'رم', 'Rome', '06', 'rome', 1),
+    ('italy', 'میلان', 'Milan', '02', 'milan', 2),
+    ('kosovo', 'Pristina', 'Pristina', '38', 'pristina', 1),
+    ('latvia', 'riga', 'Riga', '6', 'riga', 1),
+    ('lithuania', 'vilnius', 'Vilnius', '5', 'vilnius', 1),
+    ('luxembourg', 'لوکزامبورگ', 'Luxembourg', '2', 'luxembourg-city', 1),
+    ('malta', 'valletta', 'Valletta', '21', 'valletta', 1),
+    ('moldova', 'chisinau', 'Chisinau', '22', 'chisinau', 1),
+    ('monaco', 'موناکو', 'Monaco', '9', 'monaco-city', 1),
+    ('montenegro', 'podgorica', 'Podgorica', '20', 'podgorica', 1),
+    ('netherlands', 'Amsterdam', 'Amsterdam', '20', 'amsterdam', 1),
+    ('north-macedonia', 'skopje', 'Skopje', '2', 'skopje', 1),
+    ('norway', 'oslo', 'Oslo', '2', 'oslo', 1),
+    ('poland', 'warsaw', 'Warsaw', '22', 'warsaw', 1),
+    ('portugal', 'lisbon', 'Lisbon', '21', 'lisbon', 1),
+    ('romania', 'bucharest', 'Bucharest', '21', 'bucharest', 1),
+    ('russia', 'moscow', 'Moscow', '495', 'moscow', 1),
+    ('russia', 'saint-petersburg', 'Saint Petersburg', '812', 'saint-petersburg', 2),
+    ('san-marino', 'san-marino-city', 'San Marino', '549', 'san-marino-city', 1),
+    ('serbia', 'belgrade', 'Belgrade', '11', 'belgrade', 1),
+    ('slovakia', 'bratislava', 'Bratislava', '2', 'bratislava', 1),
+    ('slovenia', 'ljubljana', 'Ljubljana', '1', 'ljubljana', 1),
+    ('spain', 'madrid', 'Madrid', '91', 'madrid', 1),
+    ('spain', 'barcelona', 'Barcelona', '93', 'barcelona', 2),
+    ('sweden', 'stockholm', 'Stockholm', '8', 'stockholm', 1),
+    ('switzerland', 'zurich', 'Zurich', '44', 'zurich', 1),
+    ('switzerland', 'geneva', 'Geneva', '22', 'geneva', 2),
+    ('ukraine', 'kyiv', 'Kyiv', '44', 'kyiv', 1),
+    ('united-kingdom', 'london', 'London', '20', 'london', 1),
+    ('united-kingdom', 'manchester', 'Manchester', '161', 'manchester', 2),
+    -- Far East
+    ('china', 'پکن', 'Beijing', '10', 'beijing', 1),
+    ('china', 'Shanghai', 'Shanghai', '21', 'shanghai', 2),
+    ('china', 'guangzhou', 'Guangzhou', '20', 'guangzhou', 3),
+    ('china', 'shenzhen', 'Shenzhen', '755', 'shenzhen', 4),
+    ('japan', 'Tokyo', 'Tokyo', '3', 'tokyo', 1),
+    ('japan', 'osaka', 'Osaka', '6', 'osaka', 2),
+    ('japan', 'kyoto', 'Kyoto', '75', 'kyoto', 3),
+    ('south-korea', 'سئول', 'Seoul', '2', 'seoul', 1),
+    ('south-korea', 'busan', 'Busan', '51', 'busan', 2),
+    ('taiwan', 'taipei', 'Taipei', '2', 'taipei', 1),
+    ('hong-kong', 'هنگ‌کنگ', 'Hong Kong', '2', 'hong-kong-city', 1),
+    ('macau', 'ماکائو', 'Macau', '28', 'macau-city', 1),
+    ('mongolia', 'ulaanbaatar', 'Ulaanbaatar', '11', 'ulaanbaatar', 1),
+    ('north-korea', 'pyongyang', 'Pyongyang', '2', 'pyongyang', 1),
+    ('singapore', 'سنگاپور', 'Singapore', '6', 'singapore-city', 1),
+    ('malaysia', 'kuala-lumpur', 'Kuala Lumpur', '3', 'kuala-lumpur', 1),
+    ('thailand', 'bangkok', 'Bangkok', '2', 'bangkok', 1),
+    ('vietnam', 'hanoi', 'Hanoi', '24', 'hanoi', 1),
+    ('vietnam', 'ho-chi-minh-city', 'Ho Chi Minh City', '28', 'ho-chi-minh-city', 2),
+    ('indonesia', 'jakarta', 'Jakarta', '21', 'jakarta', 1),
+    ('philippines', 'manila', 'Manila', '2', 'manila', 1),
+    ('india', 'new-delhi', 'New Delhi', '11', 'new-delhi', 1),
+    ('india', 'mumbai', 'Mumbai', '22', 'mumbai', 2),
+    ('india', 'bangalore', 'Bangalore', '80', 'bangalore', 3),
+    ('bangladesh', 'dhaka', 'Dhaka', '2', 'dhaka', 1),
+    ('sri-lanka', 'colombo', 'Colombo', '11', 'colombo', 1),
+    ('nepal', 'kathmandu', 'Kathmandu', '1', 'kathmandu', 1),
+    ('myanmar', 'yangon', 'Yangon', '1', 'yangon', 1),
+    ('cambodia', 'phnom-penh', 'Phnom Penh', '23', 'phnom-penh', 1),
+    ('laos', 'vientiane', 'Vientiane', '21', 'vientiane', 1),
+    ('brunei', 'bandar-seri-begawan', 'Bandar Seri Begawan', '2', 'bandar-seri-begawan', 1)
+) AS v(country_slug, name_fa, name_en, landline_code, slug, sort_order)
+  ON c.slug = v.country_slug AND c.level = 'country'
+WHERE NOT EXISTS (
+  SELECT 1 FROM cities x WHERE x.slug = v.slug
+);
diff --git a/docs/PROJECT_CONTEXT.md b/docs/PROJECT_CONTEXT.md
index 5cc1a46..917b384 100644
--- a/docs/PROJECT_CONTEXT.md
+++ b/docs/PROJECT_CONTEXT.md
@@ -1,7 +1,7 @@
 # Meshkee CMS API — Project Context
 
 > Living reference for developers and AI assistants working on this codebase.
-> Last updated: August 18, 2026
+> Last updated: August 19, 2026
 
 ## What This Project Is
 
@@ -260,6 +260,7 @@ All routes are prefixed with `/api/v1`.
 | POST | `/auth/refresh` | Refresh token |
 | POST | `/auth/send-otp` | Send OTP (Redis-backed) |
 | POST | `/auth/verify-otp` | Verify OTP (marks cell verified; no tokens) |
+| POST | `/auth/handoff/consume` | One-time SSO ticket → tokens (customer → business dashboard) |
 | GET | `/tenants/:host` | Resolve business from domain |
 | GET | `/tenants/:host/store-specials` | Active store specials |
 | GET | `/tenants/:host/website/category-groups` | Homepage category rows |
@@ -276,6 +277,7 @@ All routes are prefixed with `/api/v1`.
 | GET | `/auth/me` | Any user |
 | PATCH | `/auth/profile` | Any user |
 | POST | `/auth/change-password` | Any user |
+| POST | `/auth/handoff` | Staff/owner/super-admin; issues a 60s one-time SSO ticket |
 | GET | `/roles?scope=global\|team` | Super admin / team.read |
 | GET | `/business-categories` | Super admin or `business_categories.read` |
 
@@ -419,6 +421,7 @@ Each resource typically has: `read`, `create`, `update`, `delete` (+ `publish` f
 - `POST /auth/login-otp` → passwordless login (consumes OTP, verifies cell, returns tokens)
 - `POST /auth/reset-password` → forgot password (OTP + `newPassword`, verifies cell)
 - Password login (`POST /auth/login`) rejects unverified cells when SMS is enabled
+- Dashboard SSO: `POST /auth/handoff` (JWT) stores a one-time Redis ticket (`sso:handoff:{ticket}`, 60s). Business dashboard calls `POST /auth/handoff/consume` and receives tokens.
 - JWT payload: `sub`, `cellNumber`, `roles`, `dashboard`, `type`
 - SMS provider: Gama (`sms.igama.ir`) SendQuick via service shortcode (`SMS_GAMA_*`)
 - Partner gateway (external sites like Balout): `POST /api/v1/public/sms/send` with `X-Api-Key` + body `{ domain, to, message }`; partners configured in `SMS_PARTNERS` (`domain:apiKey` pairs). Rate limits: 30/partner/min and 5/destination/min. Not part of storefront website-api docs.
diff --git a/src/auth/auth.controller.ts b/src/auth/auth.controller.ts
index a3b2b95..15996ae 100644
--- a/src/auth/auth.controller.ts
+++ b/src/auth/auth.controller.ts
@@ -13,6 +13,7 @@ import { CurrentUser } from './decorators/current-user.decorator';
 import { ChangePasswordDto } from './dto/change-password.dto';
 import { LoginDto } from './dto/login.dto';
 import { LoginOtpDto } from './dto/login-otp.dto';
+import { ConsumeHandoffDto } from './dto/consume-handoff.dto';
 import { RefreshTokenDto } from './dto/refresh-token.dto';
 import { RegisterDto } from './dto/register.dto';
 import { ResetPasswordDto } from './dto/reset-password.dto';
@@ -60,6 +61,17 @@ export class AuthController {
     return this.authService.refresh(dto.refreshToken);
   }
 
+  @Post('handoff')
+  @UseGuards(JwtAuthGuard)
+  createHandoff(@CurrentUser() user: AuthUser) {
+    return this.authService.createHandoff(user);
+  }
+
+  @Post('handoff/consume')
+  consumeHandoff(@Body() dto: ConsumeHandoffDto) {
+    return this.authService.consumeHandoff(dto.ticket);
+  }
+
   @Get('me')
   @UseGuards(JwtAuthGuard)
   me(@CurrentUser() user: AuthUser) {
diff --git a/src/auth/auth.service.ts b/src/auth/auth.service.ts
index 9e9586a..7c090ac 100644
--- a/src/auth/auth.service.ts
+++ b/src/auth/auth.service.ts
@@ -1,6 +1,7 @@
 import {
   BadRequestException,
   ConflictException,
+  ForbiddenException,
   HttpException,
   Injectable,
   ServiceUnavailableException,
@@ -9,6 +10,7 @@ import {
 import { ConfigService } from '@nestjs/config';
 import { JwtService } from '@nestjs/jwt';
 import * as bcrypt from 'bcrypt';
+import { randomBytes } from 'node:crypto';
 import { PrismaService } from '../prisma/prisma.service';
 import { RedisService } from '../redis/redis.service';
 import { TenantService } from '../tenant/tenant.service';
@@ -28,6 +30,9 @@ import { parseUserProfile } from './profile.util';
 import { SmsService } from './sms.service';
 
 const OTP_TTL_SECONDS = 300;
+const HANDOFF_TTL_SECONDS = 60;
+const HANDOFF_RATE_LIMIT = 10;
+const HANDOFF_RATE_WINDOW_SECONDS = 60;
 
 @Injectable()
 export class AuthService {
@@ -216,6 +221,62 @@ export class AuthService {
     };
   }
 
+  async createHandoff(user: AuthUser) {
+    if (!this.canAccessBusinessDashboard(user)) {
+      throw new ForbiddenException(
+        'This account cannot open the business dashboard.',
+      );
+    }
+
+    const allowed = await this.redis.incrementWithLimit(
+      `sso:handoff:rate:${user.id.toString()}`,
+      HANDOFF_RATE_LIMIT,
+      HANDOFF_RATE_WINDOW_SECONDS,
+    );
+    if (!allowed) {
+      throw new HttpException('Too many dashboard handoff requests. Try again shortly.', 429);
+    }
+
+    const ticket = randomBytes(32).toString('hex');
+    await this.redis.setHandoffTicket(
+      ticket,
+      user.id.toString(),
+      HANDOFF_TTL_SECONDS,
+    );
+
+    return {
+      ticket,
+      expiresInSeconds: HANDOFF_TTL_SECONDS,
+    };
+  }
+
+  async consumeHandoff(ticket: string) {
+    const userId = await this.redis.consumeHandoffTicket(ticket);
+    if (!userId) {
+      throw new UnauthorizedException('Invalid or expired dashboard handoff');
+    }
+
+    const authUser = await this.getAuthUser(BigInt(userId));
+    if (!authUser || !this.canAccessBusinessDashboard(authUser)) {
+      throw new ForbiddenException(
+        'This account cannot access the business dashboard.',
+      );
+    }
+
+    await this.prisma.user.update({
+      where: { id: authUser.id },
+      data: { lastLoginAt: new Date() },
+    });
+
+    const tokens = await this.issueTokens(authUser);
+
+    return {
+      message: 'Login successful',
+      user: this.serializeUser(authUser),
+      ...tokens,
+    };
+  }
+
   async me(user: AuthUser) {
     return { user: this.serializeUser(user) };
   }
@@ -526,6 +587,13 @@ export class AuthService {
     return 'customer';
   }
 
+  private canAccessBusinessDashboard(user: AuthUser): boolean {
+    if (user.roles.includes('super_admin')) {
+      return true;
+    }
+    return user.businesses.length > 0;
+  }
+
   private async issueTokens(user: AuthUser) {
     const accessPayload: AuthJwtPayload = {
       sub: user.id.toString(),
diff --git a/src/auth/dto/consume-handoff.dto.ts b/src/auth/dto/consume-handoff.dto.ts
new file mode 100644
index 0000000..f0a3605
--- /dev/null
+++ b/src/auth/dto/consume-handoff.dto.ts
@@ -0,0 +1,9 @@
+import { IsString, Matches } from 'class-validator';
+
+export class ConsumeHandoffDto {
+  @IsString()
+  @Matches(/^[a-f0-9]{64}$/, {
+    message: 'ticket must be a 64-character hex string',
+  })
+  ticket!: string;
+}
diff --git a/src/redis/redis.service.ts b/src/redis/redis.service.ts
index df720d4..8119f31 100644
--- a/src/redis/redis.service.ts
+++ b/src/redis/redis.service.ts
@@ -22,6 +22,22 @@ export class RedisService {
     await this.redis.del(`otp:${cellNumber}`);
   }
 
+  async setHandoffTicket(
+    ticket: string,
+    userId: string,
+    ttlSeconds: number,
+  ): Promise<void> {
+    await this.redis.set(`sso:handoff:${ticket}`, userId, 'EX', ttlSeconds);
+  }
+
+  /** Atomically read and delete a one-time SSO ticket. */
+  async consumeHandoffTicket(ticket: string): Promise<string | null> {
+    const key = `sso:handoff:${ticket}`;
+    const result = await this.redis.multi().get(key).del(key).exec();
+    const value = result?.[0]?.[1];
+    return typeof value === 'string' ? value : null;
+  }
+
   /**
    * Sliding fixed-window counter. Returns true if the call is within `limit`
    * for the given key over `windowSeconds`.