> ## Documentation Index > Fetch the complete documentation index at: https://docs.trackup.me/llms.txt > Use this file to discover all available pages before exploring further. # Create a project link or A/B test > Requires link.create. Normalizes pathname with a leading slash and rejects an existing pathname with 409. A traffic_source link requires trafficSourceId. Supplied A/B test variants must include at least two pages, except for traffic_source links. ## OpenAPI ````yaml https://api.trackup.me/openapi.json post /v1/projects/{id}/links openapi: 3.1.0 info: title: Trackup API description: >- API-key-accessible Trackup operations. Send your key in the `X-Api-Key` header. Keys belong to a team. `X-Team-Id` is not required; if supplied, it must match that team. Each operation lists its required key permission. The key creator must remain a team member and normally hold that permission. The ingest-only permissions `visitor.create`, `conversion.create`, and `request.create` do not need to be held by the creator. Project access and selection are described per operation. Session-only account, administration and OAuth operations are not part of this reference. The same operations are available as MCP tools at `/mcp` (Streamable HTTP). Authenticate with `X-Api-Key` or connect through OAuth, which issues an API key on consent. Schema validation errors return HTTP 422 with an `errors` object. Other errors generally contain `error` and `message`; operation-specific responses describe exceptions. version: 1.0.0 servers: - url: / description: Current API environment security: - ApiKey: [] paths: /v1/projects/{id}/links: post: tags: - Links summary: Create a project link or A/B test description: >- Requires link.create. Normalizes pathname with a leading slash and rejects an existing pathname with 409. A traffic_source link requires trafficSourceId. Supplied A/B test variants must include at least two pages, except for traffic_source links. operationId: createLink parameters: - in: path name: id schema: type: string format: uuid required: true requestBody: required: true content: application/json: schema: type: object properties: name: type: string minLength: 1 maxLength: 255 pathname: type: string minLength: 1 maxLength: 1024 type: type: string enum: - generic - traffic_source - sales_platform trafficSourceId: type: - string - 'null' format: uuid salesPlatformId: type: - string - 'null' format: uuid urls: type: array items: type: object properties: pageId: type: string format: uuid name: type: string minLength: 1 maxLength: 255 weight: type: integer minimum: 0 isActive: type: boolean salesPlatformId: type: - string - 'null' format: uuid required: - pageId required: - name - pathname - type responses: '201': description: Created link with its newly created variants. content: application/json: schema: $ref: '#/components/schemas/CreatedLink' '400': description: Malformed request or an invalid operation. content: application/json: schema: $ref: '#/components/schemas/ApiError' '401': description: The X-Api-Key header is missing or the API key is invalid. content: application/json: schema: $ref: '#/components/schemas/ApiError' '403': description: >- The key is expired, revoked, lacks permission, or its creator no longer has the required team access. A conflicting X-Team-Id is also rejected. content: application/json: schema: $ref: '#/components/schemas/ApiError' '404': description: >- The requested resource was not found or is outside the permitted scope. content: application/json: schema: $ref: '#/components/schemas/ApiError' '409': description: The operation conflicts with existing data. content: application/json: schema: $ref: '#/components/schemas/ApiError' '422': description: >- Invalid input. Each field path maps to its first validation message; _form identifies an object-level error. content: application/json: schema: $ref: '#/components/schemas/ValidationError' '500': description: An unexpected error occurred. content: application/json: schema: $ref: '#/components/schemas/ApiError' components: schemas: CreatedLink: type: object properties: id: type: string format: uuid projectId: type: string format: uuid name: type: string pathname: type: string type: type: string enum: - generic - traffic_source - sales_platform trafficSourceId: type: - string - 'null' format: uuid salesPlatformId: type: - string - 'null' format: uuid createdAt: type: string format: date-time urls: type: array items: $ref: '#/components/schemas/UrlVariant' required: - id - projectId - name - pathname - type - trafficSourceId - salesPlatformId - createdAt - urls example: id: 44444444-4444-4444-8444-444444444444 projectId: 11111111-1111-4111-8111-111111111111 name: Landing experiment pathname: /landing-test type: generic trafficSourceId: null salesPlatformId: null createdAt: '2026-10-26T12:00:00.000Z' urls: - id: 55555555-5555-4555-8555-555555555555 pageId: 33333333-3333-4333-8333-333333333333 salesPlatformId: null name: Landing A weight: 50 isActive: true - id: 77777777-7777-4777-8777-777777777777 pageId: 88888888-8888-4888-8888-888888888888 salesPlatformId: null name: Landing B weight: 50 isActive: true ApiError: type: object properties: error: type: string message: type: string required: - error - message additionalProperties: true ValidationError: type: object properties: errors: type: object additionalProperties: type: string required: - errors UrlVariant: type: object properties: id: type: string format: uuid pageId: type: string format: uuid salesPlatformId: type: - string - 'null' format: uuid name: type: string weight: type: number isActive: type: boolean required: - id - pageId - salesPlatformId - name - weight - isActive example: id: 55555555-5555-4555-8555-555555555555 pageId: 33333333-3333-4333-8333-333333333333 salesPlatformId: null name: Landing A weight: 50 isActive: true securitySchemes: ApiKey: type: apiKey in: header name: X-Api-Key ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.