openapi: 3.1.0
info:
  title: Customer.io App Activities Alias API
  description: The Customer.io App API enables developers to manage workspace resources and send messages programmatically. It provides endpoints for sending transactional messages, triggering broadcasts, managing customers and segments, retrieving campaign and newsletter data, and exporting customer information. The API uses bearer token authentication with an App API key and is designed for operations that go beyond data ingestion, such as retrieving metrics, managing message templates, and automating outbound communications from Customer.io.
  version: 1.0.0
  contact:
    name: Customer.io Support
    url: https://customer.io/contact
  termsOfService: https://customer.io/legal/terms-of-service
servers:
- url: https://api.customer.io/v1
  description: US Production Server
- url: https://api-eu.customer.io/v1
  description: EU Production Server
security:
- bearerAuth: []
tags:
- name: Alias
  description: Merge two user identities by creating an alias linking a new identity to an existing one.
paths:
  /alias:
    post:
      operationId: aliasPerson
      summary: Alias a person
      description: Creates an alias linking a new identity to an existing one. This merges two user identities so all future events from either identity are associated with the same person. Requires a previousId and a userId.
      tags:
      - Alias
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AliasRequest'
      responses:
        '200':
          description: Alias created successfully.
        '400':
          description: Bad request. Missing previousId.
        '401':
          description: Unauthorized. Invalid CDP API key.
components:
  schemas:
    AliasRequest:
      type: object
      required:
      - previousId
      - userId
      description: An alias call that links two user identities.
      properties:
        userId:
          type: string
          description: The new user identifier.
        previousId:
          type: string
          description: The previous user identifier to merge with the new one.
        context:
          $ref: '#/components/schemas/Context'
        timestamp:
          type: string
          format: date-time
          description: ISO 8601 timestamp of when the alias was created.
        messageId:
          type: string
          description: A unique identifier for this message for deduplication.
    Context:
      type: object
      description: Contextual information about the API call. Contains information about the device, library, and other environmental details.
      properties:
        ip:
          type: string
          description: The IP address of the user.
        locale:
          type: string
          description: The locale of the user.
        timezone:
          type: string
          description: The timezone of the user.
        userAgent:
          type: string
          description: The user agent string.
        library:
          type: object
          description: Information about the library making the call.
          properties:
            name:
              type: string
              description: The library name.
            version:
              type: string
              description: The library version.
        device:
          type: object
          description: Information about the user device.
          properties:
            id:
              type: string
              description: The device identifier.
            manufacturer:
              type: string
              description: The device manufacturer.
            model:
              type: string
              description: The device model.
            type:
              type: string
              description: The device type.
        os:
          type: object
          description: Information about the user operating system.
          properties:
            name:
              type: string
              description: The operating system name.
            version:
              type: string
              description: The operating system version.
        page:
          type: object
          description: Information about the current page for web contexts.
          properties:
            url:
              type: string
              format: uri
              description: The page URL.
            title:
              type: string
              description: The page title.
            referrer:
              type: string
              format: uri
              description: The referring URL.
            path:
              type: string
              description: The page path.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Bearer token authentication using your App API key. Pass the key in the Authorization header as Bearer {app_api_key}.
externalDocs:
  description: App API Documentation
  url: https://docs.customer.io/integrations/api/app/