> ## Documentation Index > Fetch the complete documentation index at: https://docs.cog888.net/llms.txt > Use this file to discover all available pages before exploring further. # User Login > User login to game and get game URL | Code | Description | | ---- | ------------------- | | 2 | Invalid parameter | | 18 | Player is forbidden | | 36 | Server error | | 9999 | Unknown error | ## OpenAPI ````yaml en/seamless-openapi.json POST /api/v1/dt/game openapi: 3.1.0 info: title: Seamless Wallet API description: Seamless Wallet API documentation, including Game-API and Wallet-API version: 1.0.0 servers: - url: https://api.example.com description: API Server security: [] tags: - name: Game-API User description: Game API - User operations - name: Game-API Report description: Game API - Report queries - name: Game-API Internal description: Game API - Internal use (hidden) - name: Wallet-API description: Wallet API - Implemented by vendor paths: /api/v1/dt/game: post: tags: - Game-API User summary: User Login description: User login to game and get game URL operationId: launchGame requestBody: required: true content: application/json: schema: type: object required: - uuid - platform_id - username - transaction_id - credit - key properties: uuid: type: string description: >- Platform-defined unique request serial number, length >= 32 and <= 128 bytes platform_id: type: string description: Platform product ID username: type: string description: >- User account in game (max 23 characters, lowercase letters and numbers only) transaction_id: type: string description: >- Transaction serial number (1-128 characters, ASCII 32-126 printable characters only, ` and ~ are prohibited) credit: type: string description: >- Credit to bring into game for this login, must be 0 for seamless wallet lang: type: string description: Language code, optional key: type: string description: md5(username + credit + transaction_id + platform_secret) homeUrl: type: string description: >- Online casino homepage, must be encoded with encodeURIComponent registerUrl: type: string description: >- Online casino registration URL, must be encoded with encodeURIComponent depositUrl: type: string description: >- Online casino deposit URL, must be encoded with encodeURIComponent withdrawUrl: type: string description: >- Online casino withdrawal URL, must be encoded with encodeURIComponent extendSessionUrl: type: string description: >- Online casino session extension URL, must be encoded with encodeURIComponent theme_pid: type: string description: >- UI skin pid to display, default value will be shown if not provided title: type: string description: >- Product name displayed on browser tab, COG will be shown if not provided favicon: type: string description: >- Product favicon displayed on browser tab, COG favicon will be shown if not provided logoLandscape: type: string description: >- Logo displayed in lobby landscape mode, COG logo will be shown if not provided site: type: string description: >- Pass 'app' string to hide the swipe-up fullscreen overlay on mobile H5 landscape mode device: type: string description: >- Device type, accepts PC or MB, defaults to PC if not provided; the passed value is appended to the game URL as device=PC or device=MB, and is omitted when not provided example: uuid: e69da788a6c841d4953c475fc42bf464 platform_id: AXTES username: player001 transaction_id: TX123456 credit: '0' key: abc123hash homeUrl: https%3A%2F%2Fwww.example.com lang: zh-tw responses: '200': description: Success content: application/json: schema: type: object properties: url: type: string description: >- URL to redirect to game platform (same as the first item of urls, kept for backward compatibility) urls: type: array items: type: string description: >- Array of game platform URLs for multiple routes (domain rotation / failover); the first item equals url. When the platform has only one route configured, the array contains a single item example: url: >- https://rel-game.cog888.net?pid=R01C05&token=zL13tWjRw2d0mHJSAkNtyNgjAsfTjavP6e9gQLpsOF-&homeUrl=home®isterUrl=register&depositUrl=deposit&withdrawUrl=withdraw&extendSessionUrl=extend&lang=en-us&closeAppOnLogout=1 urls: - >- https://rel-game.cog888.net?pid=R01C05&token=zL13tWjRw2d0mHJSAkNtyNgjAsfTjavP6e9gQLpsOF-&homeUrl=home®isterUrl=register&depositUrl=deposit&withdrawUrl=withdraw&extendSessionUrl=extend&lang=en-us&closeAppOnLogout=1 - >- https://rel-game.cog888.net2?pid=R01C05&token=zL13tWjRw2d0mHJSAkNtyNgjAsfTjavP6e9gQLpsOF-&homeUrl=home®isterUrl=register&depositUrl=deposit&withdrawUrl=withdraw&extendSessionUrl=extend&lang=en-us&closeAppOnLogout=1 - >- https://rel-game.cog888.net3?pid=R01C05&token=zL13tWjRw2d0mHJSAkNtyNgjAsfTjavP6e9gQLpsOF-&homeUrl=home®isterUrl=register&depositUrl=deposit&withdrawUrl=withdraw&extendSessionUrl=extend&lang=en-us&closeAppOnLogout=1 '400': description: Request Error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: 2 msg: >- request hash signature(0FACF22B9E3DB5CDC670A0F7A65BB76A) is error uuid: 9e96610f-5388-42df-b3ed-ba1b3178c63b components: schemas: ErrorResponse: type: object properties: code: type: string description: Error code message: type: string description: Error message data: description: Data (usually null) status_code: type: integer description: HTTP status code service: type: string description: Service name ````