openapi: 3.1.0
info:
  title: ActiveCampaign Broadcasts Custom Fields API
  version: '3'
  description: ActiveCampaign's REST API (version 3) for marketing automation, CRM, sales pipelines, and customer engagement. Covers contacts, lists, deals, campaigns, segments, custom fields, variables, broadcasts, and bulk operations. Authentication is via an account-specific API key supplied in the `Api-Token` header (the developer portal also references `X-Auth-Token`).
  contact:
    name: ActiveCampaign Developers
    url: https://developers.activecampaign.com
servers:
- url: https://{account}.api-us1.com
  description: Account-scoped ActiveCampaign API server
  variables:
    account:
      default: example
      description: Your ActiveCampaign account subdomain
security:
- ApiKeyAuth: []
tags:
- name: Custom Fields
paths:
  /api/3/fields:
    get:
      summary: List all custom fields
      tags:
      - Custom Fields
    post:
      summary: Create a custom field
      tags:
      - Custom Fields
  /api/3/fields/{fieldID}:
    get:
      summary: Retrieve a specific custom field
      tags:
      - Custom Fields
  /api/3/fieldValues:
    put:
      summary: Update a custom field value for a contact
      tags:
      - Custom Fields
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: Api-Token