> ## Documentation Index > Fetch the complete documentation index at: https://docs.passionfroot.me/llms.txt > Use this file to discover all available pages before exploring further. # Apply to a campaign > Applies to an open campaign with a message, as the campaign page in the app does. The creator has to match the campaign's categories and audience reach, or gets `NOT_ELIGIBLE`. A campaign that has closed answers `CAMPAIGN_CLOSED`. Naturally idempotent, so applying again returns the existing application with a 200. ## OpenAPI ````yaml /openapi/creator.yaml post /discover/campaigns/{campaignId}/apply openapi: 3.1.0 info: title: Passionfroot Creator API version: 1.0.0-alpha description: > Access a creator's own partners, collaborations, placements, catalog, proposals, and conversations, and the open campaigns in Discover. The API is in alpha. Every operation is restricted to the creator account that owns the API key. servers: - url: https://workspace.passionfroot.me/api/creators/v1 security: - bearerAuth: [] tags: - name: Placements - name: Partners - name: Collaborations - name: Conversations - name: Catalog - name: Requests - name: Proposals - name: Discover paths: /discover/campaigns/{campaignId}/apply: post: tags: - Discover summary: Apply to a campaign description: >- Applies to an open campaign with a message, as the campaign page in the app does. The creator has to match the campaign's categories and audience reach, or gets `NOT_ELIGIBLE`. A campaign that has closed answers `CAMPAIGN_CLOSED`. Naturally idempotent, so applying again returns the existing application with a 200. operationId: applyToCreatorDiscoverCampaign parameters: - $ref: '#/components/parameters/CampaignId' requestBody: required: true content: application/json: schema: type: object additionalProperties: false required: - message properties: message: type: string maxLength: 10000 description: >- Why you're a good fit, as plain text or simple HTML. A message with an email address in it is refused, since brands reply in Passionfroot. example: message: >- My audience is 20k indie developers, and my last sponsored video for a dev tool got 4% clicks. responses: '200': $ref: '#/components/responses/CampaignApplication' '201': $ref: '#/components/responses/CampaignApplication' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '404': $ref: '#/components/responses/NotFound' '409': $ref: '#/components/responses/Conflict' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/ServerError' '503': $ref: '#/components/responses/ServiceUnavailable' components: parameters: CampaignId: name: campaignId in: path required: true schema: type: string responses: CampaignApplication: description: The creator's application to the campaign. content: application/json: schema: type: object required: - data properties: data: $ref: '#/components/schemas/CampaignApplication' BadRequest: description: Invalid parameters or body. content: application/json: schema: $ref: '#/components/schemas/Error' Unauthorized: description: >- Missing, invalid, expired, or revoked API key, or a creator account that is not approved. content: application/json: schema: $ref: '#/components/schemas/Error' Forbidden: description: >- The key lacks the required scope, the creator has no payouts set up for Discover (`DISCOVER_UNAVAILABLE`), or the creator doesn't match the campaign they apply to (`NOT_ELIGIBLE`). content: application/json: schema: $ref: '#/components/schemas/Error' NotFound: description: Resource not found or not owned by this creator. content: application/json: schema: $ref: '#/components/schemas/Error' Conflict: description: >- The operation conflicts with current state or an identical write is in progress. content: application/json: schema: $ref: '#/components/schemas/Error' TooManyRequests: description: Rate limit exceeded. headers: Retry-After: $ref: '#/components/headers/RetryAfter' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: RATE_LIMITED message: >- This API key is over its rate limit. Wait for Retry-After before sending more. details: limit: 2 windowSeconds: 1 ServerError: description: Unexpected server failure. Re-read state before retrying a write. content: application/json: schema: $ref: '#/components/schemas/Error' ServiceUnavailable: description: >- Temporary key-verification or write-lock infrastructure failure. Retry after the indicated delay. headers: Retry-After: $ref: '#/components/headers/RetryAfter' content: application/json: schema: $ref: '#/components/schemas/Error' schemas: CampaignApplication: type: object required: - id - status - message - createdAt properties: id: type: string status: type: string enum: - pending - reviewing - accepted - rejected description: '`reviewing` means the brand saved the application for later.' message: type: string description: >- The message the brand received with the application. May contain basic HTML. createdAt: type: string format: date-time Error: type: object additionalProperties: false required: - error description: >- The body of every error response. Branch on `code`; messages can be reworded. properties: error: type: object additionalProperties: false required: - code - message properties: code: type: string description: >- Stable, machine-readable reason. New codes may be added; existing ones never change meaning. enum: - INVALID_REQUEST - INVALID_QUERY_PARAMETER - INVALID_BODY - INVALID_ID - INVALID_CURSOR - INVALID_IDEMPOTENCY_KEY - UNAUTHENTICATED - MISSING_SCOPE - DISCOVER_UNAVAILABLE - NOT_ELIGIBLE - NOT_FOUND - METHOD_NOT_ALLOWED - CONFLICT - CAMPAIGN_CLOSED - IDEMPOTENCY_IN_PROGRESS - UNPROCESSABLE - IDEMPOTENCY_KEY_REUSED - RATE_LIMITED - INTERNAL_ERROR - SERVICE_UNAVAILABLE message: type: string description: >- What went wrong and what to do next, written for a developer or agent. details: description: >- Present only when there is something structured to act on, such as one entry per invalid field (`{ field, message }`). headers: RetryAfter: description: Seconds to wait before retrying. schema: type: integer minimum: 1 securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: Passionfroot API key description: >- Create an API key from Settings → AI agents & API in an approved Creator workspace. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.