openapi: 3.1.0
info:
  title: Heroku Platform Account Formation API
  description: The Heroku Platform API enables programmatic access to Heroku's deployment platform. Manage apps, dynos, add-ons, config vars, domains, pipelines, releases, and other platform resources.
  version: '3'
  contact:
    name: Heroku
    url: https://devcenter.heroku.com/
  license:
    name: Proprietary
    url: https://www.heroku.com/policy/tos
servers:
- url: https://api.heroku.com
  description: Heroku Platform API
security:
- BearerAuth: []
tags:
- name: Formation
  description: Process type scaling
paths:
  /apps/{app_id_or_name}/formation:
    get:
      operationId: listFormation
      summary: List formation
      description: List process type scaling info.
      tags:
      - Formation
      parameters:
      - $ref: '#/components/parameters/appIdOrName'
      responses:
        '200':
          description: Formation info
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Formation'
    patch:
      operationId: batchUpdateFormation
      summary: Batch update formation
      description: Update scaling for multiple process types.
      tags:
      - Formation
      parameters:
      - $ref: '#/components/parameters/appIdOrName'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - updates
              properties:
                updates:
                  type: array
                  items:
                    type: object
                    required:
                    - type
                    properties:
                      type:
                        type: string
                      quantity:
                        type: integer
                      size:
                        type: string
      responses:
        '200':
          description: Formation updated
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Formation'
  /apps/{app_id_or_name}/formation/{formation_id_or_type}:
    patch:
      operationId: updateFormation
      summary: Update a process type
      tags:
      - Formation
      parameters:
      - $ref: '#/components/parameters/appIdOrName'
      - name: formation_id_or_type
        in: path
        required: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                quantity:
                  type: integer
                size:
                  type: string
      responses:
        '200':
          description: Process type updated
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Formation'
components:
  schemas:
    Formation:
      type: object
      properties:
        id:
          type: string
          format: uuid
        type:
          type: string
          description: Process type name (web, worker, etc.)
        command:
          type: string
        quantity:
          type: integer
        size:
          type: string
        app:
          type: object
          properties:
            id:
              type: string
              format: uuid
            name:
              type: string
        created_at:
          type: string
          format: date-time
        updated_at:
          type: string
          format: date-time
  parameters:
    appIdOrName:
      name: app_id_or_name
      in: path
      required: true
      schema:
        type: string
      description: App ID (UUID) or app name
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: Heroku API key or OAuth token