Ozow Refunds API

openapi: 3.2.0
info:
  title: Ozow Banks Refunds API
  description: Ozow (formerly i-Pay) is a South African instant EFT / "Pay by Bank" payment gateway. Merchants create a payment request server-side, redirect the customer to the Ozow secure bank-selection flow, and receive a server-to-server notification plus browser redirect on completion. All write requests are authenticated with an ApiKey header and a SHA512 HashCheck computed by concatenating the request fields in documented order, appending the merchant PrivateKey, lower-casing, and hashing. Transactions are ZAR-only (CountryCode ZA, CurrencyCode ZAR).
  termsOfService: https://ozow.com/terms-and-conditions
  contact:
    name: Ozow Support
    email: support@ozow.com
    url: https://hub.ozow.com/docs
  version: '1.0'
servers:
- url: https://api.ozow.com
  description: Production
- url: https://stagingapi.ozow.com
  description: Staging / sandbox (also driven by the IsTest flag)
tags:
- name: Refunds
  description: Refund previously completed EFT payments from the merchant float.
paths:
  /PostRefundRequest:
    post:
      operationId: postRefundRequest
      tags:
      - Refunds
      summary: Request a refund
      description: Instructs Ozow to refund a previously completed EFT payment from the merchant Ozow float. Refund requests are authenticated with a bearer token obtained from the Ozow identity/token service (not the ApiKey header) and carry their own HashCheck. Ozow notifies the merchant NotifyUrl when the refund completes or fails.
      security:
      - BearerToken: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RefundRequest'
      responses:
        '200':
          description: Refund accepted for processing.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RefundResponse'
        '400':
          description: Invalid request or hash mismatch.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    ErrorResponse:
      type: object
      properties:
        errorMessage:
          type: string
        errorCode:
          type: string
    RefundRequest:
      type: object
      required:
      - SiteCode
      - TransactionId
      - Amount
      - RefundReference
      - HashCheck
      properties:
        SiteCode:
          type: string
        TransactionId:
          type: string
          description: Ozow transaction id of the original completed payment.
        Amount:
          type: number
          format: double
        RefundReference:
          type: string
        NotifyUrl:
          type: string
          format: uri
        IsTest:
          type: boolean
        HashCheck:
          type: string
    RefundResponse:
      type: object
      properties:
        refundId:
          type: string
        status:
          type: string
        errorMessage:
          type:
          - string
          - 'null'
  securitySchemes:
    ApiKey:
      type: apiKey
      in: header
      name: ApiKey
      description: Merchant API key issued in the Ozow merchant dashboard (dash.ozow.com). Sent alongside a SHA512 HashCheck field computed with the merchant PrivateKey.
    BearerToken:
      type: http
      scheme: bearer
      description: OAuth-style bearer token obtained from the Ozow token endpoint, used by the Refunds and Payouts APIs. Tokens are reusable until expiry.