> ## Documentation Index
> Fetch the complete documentation index at: https://docs.semicola.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Attach a creative to campaigns (format fit)



## OpenAPI

````yaml /openapi/buyer.yaml post /api/v2/buyer/advertisers/{id}/creatives/{cid}/campaigns
openapi: 3.1.0
info:
  title: Semicola Exchange buyer API
  version: 2.0.0
  description: >-
    Buyer endpoints: advertisers, storefronts and connections, product
    discovery, campaigns, proposals, media buys, creatives and reporting. Every
    write accepts an Idempotency-Key header.
servers:
  - url: https://api.semicola.com
security:
  - bearerAuth: []
  - sessionCookie: []
tags:
  - name: Advertisers
  - name: Storefronts
  - name: Product Discovery
  - name: Campaigns
  - name: Media Buys
  - name: Creatives
  - name: Reporting
  - name: Event Sources
  - name: Webhooks
  - name: Tasks
  - name: Audit Logs
paths:
  /api/v2/buyer/advertisers/{id}/creatives/{cid}/campaigns:
    post:
      tags:
        - Creatives
      summary: Attach a creative to campaigns (format fit)
      operationId: postBuyerAdvertisersByIdCreativesByCidCampaigns
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: integer
            exclusiveMinimum: 0
            maximum: 9007199254740991
        - name: cid
          in: path
          required: true
          schema:
            type: string
            minLength: 1
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                campaignIds:
                  minItems: 1
                  type: array
                  items:
                    type: string
              required:
                - campaignIds
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    anyOf:
                      - type: object
                        properties:
                          creativeId:
                            type: string
                          attachments:
                            type: array
                            items:
                              type: object
                              properties:
                                campaignId:
                                  type: string
                                fit:
                                  type: object
                                  properties:
                                    fit:
                                      type: string
                                      enum:
                                        - fits
                                        - fits_with_adaptation
                                        - insufficient_facts
                                        - nothing_fits
                                    adaptations:
                                      type: array
                                      items:
                                        type: string
                                        enum:
                                          - resize
                                          - letterbox
                                          - trim
                                          - transcode
                                    missingFacts:
                                      type: array
                                      items:
                                        type: string
                                        enum:
                                          - size
                                          - duration
                                          - codec
                                          - container
                                    closest:
                                      type:
                                        - string
                                        - 'null'
                                  required:
                                    - fit
                                    - adaptations
                                    - missingFacts
                                    - closest
                                  additionalProperties: false
                              required:
                                - campaignId
                                - fit
                              additionalProperties: false
                        required:
                          - creativeId
                          - attachments
                        additionalProperties: false
                      - type: 'null'
                  error:
                    anyOf:
                      - type: object
                        properties:
                          code:
                            type: string
                          message:
                            type: string
                          field:
                            type: string
                          details: {}
                        required:
                          - code
                          - message
                        additionalProperties: false
                      - type: 'null'
                required:
                  - data
                  - error
                additionalProperties: false
        default:
          description: >-
            Error envelope `{data: null, error: {code, message, field?,
            details?}}`.
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key or OAuth access token.
    sessionCookie:
      type: apiKey
      in: cookie
      name: sc_session

````