openapi: 3.1.0
info:
  title: Brightback (Chargebee ) Pre-cancel Retention API
  version: '1.0'
  description: The Brightback pre-cancel API (now Chargebee Retention) initiates a cancel ("save") session for a subscriber who is about to churn. A backend POSTs the subscriber's identity and account context to the pre-cancel endpoint and receives a unique Cancel Session URL to redirect the end user into Brightback's hosted cancel / retention experience. Server-to-server requests are authenticated with an HMAC-SHA-512 signature over the request using a Brightback-issued public/private key pair.
  x-provenance:
    method: generated
    source:
    - https://help.brightback.com/article/171-precancel-api
    - https://github.com/brightback/brightbackjs
    - https://www.chargebee.com/docs/retention/installing-chargebee-retention.html
    note: Faithful OpenAPI capture of the documented pre-cancel API. Brightback / Chargebee Retention does not publish an OpenAPI document; this is generated from the public integration docs and the archived first-party brightbackjs library. No fabricated fields.
  contact:
    name: Chargebee Retention Support
    email: retention-support@chargebee.com
    url: https://help.brightback.com
servers:
- url: https://app.brightback.com
  description: Brightback application host (legacy)
- url: https://app.retention.chargebee.com
  description: Chargebee Retention application host (current)
security:
- hmacSignature: []
  hmacPublicKey: []
tags:
- name: Retention
paths:
  /precancel:
    post:
      operationId: createPrecancelSession
      summary: Create a pre-cancel (save) session
      description: POST a subscriber's identity and account context to receive a unique Cancel Session URL for the Brightback hosted cancel experience. For server-side requests, sign the request with an HMAC-SHA-512 signature and pass the Signature and Signature-Public-Key headers.
      tags:
      - Retention
      security:
      - hmacSignature: []
        hmacPublicKey: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PrecancelRequest'
            examples:
              minimal:
                summary: Minimal request with billing integration
                value:
                  app_id: BRIGHTBACK_APP_ID
                  subscription_id: sub_12345
                  account:
                    internal_id: cust_98765
      responses:
        '200':
          description: Session created. Returns a unique Cancel Session URL.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PrecancelResponse'
              example:
                valid: true
                url: https://app.brightback.com/examplecompany/cancel/12345ABCDE
        '400':
          description: Invalid request. Required fields missing or malformed.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                valid: false
                message: Invalid request
        '401':
          description: Signature or public key invalid.
components:
  schemas:
    PrecancelResponse:
      type: object
      properties:
        valid:
          type: boolean
        url:
          type: string
          format: uri
          description: Unique Cancel Session URL to serve the end user.
        message:
          type: string
          description: In some responses the session URL is returned in message.
    Context:
      type: object
      description: End-user context captured by the browser client.
      properties:
        user_agent:
          type: string
        locale:
          type: string
        timezone:
          type: string
        url:
          type: string
        referrer:
          type: string
    ErrorResponse:
      type: object
      properties:
        valid:
          type: boolean
        message:
          type: string
    PrecancelRequest:
      type: object
      required:
      - app_id
      - account
      properties:
        app_id:
          type: string
          description: Your unique Brightback / Chargebee Retention application id.
        email:
          type: string
          format: email
          description: Subscriber email. Required if subscription_id is omitted.
        subscription_id:
          type: string
          description: Billing-system subscription id. Required if email is omitted.
        first_name:
          type: string
        last_name:
          type: string
        full_name:
          type: string
        save_return_url:
          type: string
          format: uri
          description: Redirect destination for users who do not cancel.
        cancel_confirmation_url:
          type: string
          format: uri
          description: Redirect destination for users who confirm cancellation.
        account:
          $ref: '#/components/schemas/Account'
        custom:
          type: object
          description: Free-form nested object of business-specific attributes (arrays unsupported).
          additionalProperties: true
        context:
          $ref: '#/components/schemas/Context'
    Account:
      type: object
      required:
      - internal_id
      properties:
        internal_id:
          type: string
          description: Your customer's account identifier.
        billing_id:
          type: string
        plan:
          type: string
        plan_term:
          type: string
        company_name:
          type: string
        company_domain:
          type: string
        value:
          type: number
        created_at:
          type: string
          description: Account creation timestamp.
  securitySchemes:
    hmacSignature:
      type: apiKey
      in: header
      name: Signature
      description: HMAC-SHA-512 signature computed over the request payload plus an ISO8601 timestamp, using the account's Brightback-issued private key.
    hmacPublicKey:
      type: apiKey
      in: header
      name: Signature-Public-Key
      description: The Brightback-issued public key identifying the signing account.