> ## Documentation Index > Fetch the complete documentation index at: https://docs.flowra.dev/llms.txt > Use this file to discover all available pages before exploring further. # Create a new auth link session > Generates a one-time URL to start the OAuth flow. Send your end users to this URL so they can sign in with the provider (e.g. Google, Slack) and connect their account to your project. After they complete the flow, the account appears in the connected accounts list. ## OpenAPI ````yaml /api-reference/openapi.json post /api/v1/connected_accounts/link openapi: 3.0.0 info: title: Flowra API (API Key Endpoints) description: >- **Flowra** is an AI-powered platform for building agents, workflows, and integrations. ### Capabilities - **Tools & Toolkits** – Define and group tools for agents and workflows. - **Workflows** – Orchestrate steps and automate processes. - **Triggers** – Schedule or event-based execution. - **Auth & Connections** – OAuth, API keys, and connected accounts. - **MCP** – Model Context Protocol server integration. - **Knowledge / RAG** – Add files and URLs for retrieval-augmented generation. ### Authentication Use the **x-api-key** header with a project API key to access endpoints that support API Key auth. Create and manage API keys in the dashboard under your project settings. Only endpoints that support API Key authentication via the @ApiKeyEnabled() decorator. Send x-api-key (required). On multi-tenant endpoints, optionally send x-username to act as an external user. Only endpoints that support API Key authentication via the @ApiKeyEnabled() decorator. Send x-api-key (required). On multi-tenant endpoints, optionally send x-username (defaults to the project’s default external user). version: '1.0' contact: name: Flowra url: https://flowra.dev servers: - url: https://flowra.dev description: Flowra API security: [] tags: - name: Users description: User profile - name: External Users description: End-user identities inside a project (x-username) - name: Auth Configs description: OAuth and API key configs for toolkits - name: Connected Accounts description: OAuth connected accounts and link creation - name: Toolkits description: List and search toolkits - name: Tools description: List, execute, and manage tools - name: Skills description: Browse, create, import, and install skills - name: Workflow & Agent description: Create, run, and inspect workflows and agents - name: Triggers description: Schedule and event-based trigger instances - name: Chat description: Threads and streaming agent runs - name: File description: Upload, list, and download files - name: Knowledge description: RAG knowledge collections - name: Table description: Collections and documents - name: Sandbox description: Ephemeral and durable code sandboxes - name: Browser description: Live browser sessions and view - name: LLM description: List AI models and generate completions - name: MCP description: MCP server management paths: /api/v1/connected_accounts/link: post: tags: - Connected Accounts summary: Create a new auth link session description: >- Generates a one-time URL to start the OAuth flow. Send your end users to this URL so they can sign in with the provider (e.g. Google, Slack) and connect their account to your project. After they complete the flow, the account appears in the connected accounts list. operationId: ConnectedAccountsController_createConnectedAccountLink parameters: - name: x-username in: header required: false description: >- External user (end user) to act as. Optional — if omitted, Flowra uses the project’s default external user. Send a stable username (e.g. customer_alice) only when you need another end-user context. schema: type: string default: (project default user) example: customer_alice requestBody: required: true description: Connected account link creation data content: application/json: schema: $ref: '#/components/schemas/CreateConnectedAccountLinkDto' responses: '201': description: Successfully created auth link content: application/json: schema: $ref: '#/components/schemas/CreateConnectedAccountLinkResponseDto' security: - x-api-key: [] - x-api-key: [] x-username: [] components: schemas: CreateConnectedAccountLinkDto: $ref: '#/components/schemas/CreateConnectedAccountLinkDto' type: object properties: authConfigId: type: string description: Auth configuration ID example: auth_config_123 callbackUrl: type: string description: Callback URL example: https://myapp.com/callback browserSessionId: type: string description: >- Browser session id for BROWSER_SESSION: reuse an existing chat session id, or omit to auto-generate a standalone session UUID. example: 550e8400-e29b-41d4-a716-446655440000 connectionData: description: Connection data allOf: - $ref: '#/components/schemas/ConnectedAccountConnectionValDto' required: - authConfigId CreateConnectedAccountLinkResponseDto: $ref: '#/components/schemas/CreateConnectedAccountLinkResponseDto' type: object properties: linkToken: type: string description: Link token for authentication example: link_token_123456789 redirectUrl: type: string description: Redirect URL for user authentication example: >- https://auth.composio.dev/oauth/authorize?client_id=123&redirectUri=https://myapp.com/callback expiresAt: type: string description: Expiration timestamp for the link example: '2024-12-31T23:59:59Z' connectedAccountId: type: string description: Connected account ID example: con_123456789 browserSessionId: type: string description: >- For BROWSER_SESSION: session id used for the live browser viewer (auto-generated UUID if omitted in the request). example: 550e8400-e29b-41d4-a716-446655440000 required: - redirectUrl securitySchemes: x-api-key: type: apiKey in: header name: x-api-key description: >- Project API key. Create and manage keys in the dashboard under Project → API Keys. Send as header: x-api-key: x-username: type: apiKey in: header name: x-username description: >- Optional. External user username. If omitted, Flowra uses the project’s default external user. Send as header: x-username: ````