openapi: 3.0.3
info:
  title: OpenCart REST Affiliates Payment Address API
  description: 'The OpenCart REST API enables external applications to communicate with a self-hosted OpenCart store. It provides endpoints for managing the shopping cart, customers, orders, addresses, shipping methods, payment methods, subscriptions, and affiliates. Authentication is performed by submitting API credentials to receive a session token, which must accompany subsequent requests. IP-allowlist enforcement is applied at the store level.

    '
  version: '4.0'
  contact:
    name: OpenCart Developer Documentation
    url: https://docs.opencart.com/developer/
  license:
    name: GNU GPL v3
    url: https://github.com/opencart/opencart/blob/master/LICENSE.md
servers:
- url: https://yourstore.com/index.php?route=api
  description: OpenCart store API base URL (replace yourstore.com with your store domain)
security:
- apiToken: []
tags:
- name: Payment Address
  description: Billing address management
paths:
  /payment_address:
    post:
      operationId: setPaymentAddress
      summary: Set payment (billing) address
      description: 'Validates and stores the billing address for the current session. Requires address fields including name, street, city, country, and zone.

        '
      tags:
      - Payment Address
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              $ref: '#/components/schemas/PaymentAddressInput'
      responses:
        '200':
          description: Payment address set or validation errors
          content:
            application/json:
              schema:
                oneOf:
                - $ref: '#/components/schemas/SuccessResponse'
                - $ref: '#/components/schemas/AddressErrorResponse'
  /payment_address/setAddress:
    post:
      operationId: setPaymentAddressById
      summary: Set payment address from saved customer address
      description: Selects an existing saved customer address as the billing address.
      tags:
      - Payment Address
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - payment_address_id
              properties:
                api_token:
                  type: string
                payment_address_id:
                  type: integer
                  description: ID of the saved customer address to use for billing
                  example: 5
      responses:
        '200':
          description: Payment address set or error
          content:
            application/json:
              schema:
                oneOf:
                - $ref: '#/components/schemas/SuccessResponse'
                - $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    SuccessResponse:
      type: object
      properties:
        success:
          type: string
          description: Localised success message
          example: 'Success: You have modified your shopping cart!'
    AddressErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            firstname:
              type: string
            lastname:
              type: string
            address_1:
              type: string
            city:
              type: string
            postcode:
              type: string
            country:
              type: string
            zone:
              type: string
    PaymentAddressInput:
      type: object
      required:
      - payment_firstname
      - payment_lastname
      - payment_address_1
      - payment_city
      - payment_country_id
      - payment_zone_id
      properties:
        api_token:
          type: string
        payment_firstname:
          type: string
          minLength: 1
          maxLength: 32
          example: John
        payment_lastname:
          type: string
          minLength: 1
          maxLength: 32
          example: Doe
        payment_company:
          type: string
          example: ACME Corp
        payment_address_1:
          type: string
          minLength: 3
          maxLength: 128
          example: 123 Main Street
        payment_address_2:
          type: string
          example: Suite 100
        payment_postcode:
          type: string
          minLength: 2
          maxLength: 10
          example: '90210'
        payment_city:
          type: string
          minLength: 2
          maxLength: 128
          example: Los Angeles
        payment_zone_id:
          type: integer
          example: 3635
        payment_country_id:
          type: integer
          example: 223
        payment_custom_field:
          type: object
          additionalProperties: true
    ErrorResponse:
      type: object
      properties:
        error:
          type: string
          description: Localised error message
          example: 'Warning: Permission Denied!'
  securitySchemes:
    apiToken:
      type: apiKey
      in: query
      name: api_token
      description: Session token obtained from the /login endpoint
externalDocs:
  description: OpenCart Admin API Documentation
  url: https://docs.opencart.com/admin-interface/system/users/api