{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api-evangelist.com/schemas/interswitch/interswitch-payment-schema.json",
  "title": "Interswitch Payment",
  "description": "Core payment object used across Interswitch Web Checkout, Payment Gateway, Refunds, and Recurring Payments.",
  "type": "object",
  "definitions": {
    "Payment": {
      "type": "object",
      "required": ["transactionRef", "amount", "currency", "status"],
      "properties": {
        "paymentId": { "type": "string" },
        "transactionRef": { "type": "string", "description": "Merchant-supplied unique reference." },
        "amount": { "type": "integer", "description": "Amount in minor currency units (kobo for NGN)." },
        "currency": { "type": "string", "description": "ISO 4217 alpha or numeric currency code." },
        "merchantCode": { "type": "string" },
        "payItemId": { "type": "string" },
        "customerId": { "type": "string" },
        "customerEmail": { "type": "string", "format": "email" },
        "customerMobile": { "type": "string" },
        "paymentMethod": { "$ref": "#/definitions/PaymentMethod" },
        "status": { "type": "string", "enum": ["PENDING", "SUCCESSFUL", "FAILED", "REVERSED", "REFUNDED"] },
        "responseCode": { "type": "string", "description": "00 / 90000 indicate success; see Interswitch response-codes guide." },
        "responseMessage": { "type": "string" },
        "authCode": { "type": "string" },
        "retrievalReferenceNumber": { "type": "string" },
        "cardPanMasked": { "type": "string" },
        "cardScheme": { "type": "string", "enum": ["VERVE", "VISA", "MASTERCARD"] },
        "settlementDate": { "type": "string", "format": "date" },
        "createdAt": { "type": "string", "format": "date-time" }
      }
    },
    "PaymentMethod": {
      "type": "object",
      "properties": {
        "type": { "type": "string", "enum": ["card", "token", "googlePay", "transfer", "paycode"] },
        "card": { "$ref": "#/definitions/Card" },
        "token": { "type": "string" },
        "tokenExpiryDate": { "type": "string", "format": "date" }
      }
    },
    "Card": {
      "type": "object",
      "properties": {
        "pan": { "type": "string" },
        "expiryMonth": { "type": "string" },
        "expiryYear": { "type": "string" },
        "cvv": { "type": "string" }
      }
    },
    "Refund": {
      "type": "object",
      "required": ["refundReference", "parentPaymentId", "refundType"],
      "properties": {
        "refundReference": { "type": "string" },
        "parentPaymentId": { "type": "string" },
        "refundType": { "type": "string", "enum": ["PARTIAL", "FULL"] },
        "refundAmount": { "type": "integer" },
        "status": { "type": "string", "enum": ["SUCCESS", "PENDING", "PROCESSING", "COMPLETE", "COMPLETE_MANUAL", "FAILED"] },
        "createdAt": { "type": "string", "format": "date-time" }
      }
    },
    "Transfer": {
      "type": "object",
      "required": ["transferCode", "initiation", "termination"],
      "properties": {
        "transferCode": { "type": "string" },
        "mac": { "type": "string" },
        "initiatingEntityCode": { "type": "string" },
        "initiation": {
          "type": "object",
          "properties": {
            "amount": { "type": "integer" },
            "currencyCode": { "type": "string" },
            "channel": { "type": "string" },
            "paymentMethodCode": { "type": "string" }
          }
        },
        "termination": {
          "type": "object",
          "properties": {
            "amount": { "type": "integer" },
            "currencyCode": { "type": "string" },
            "accountReceivable": {
              "type": "object",
              "properties": {
                "accountNumber": { "type": "string" },
                "accountType": { "type": "string" }
              }
            },
            "entityCode": { "type": "string" },
            "countryCode": { "type": "string" },
            "paymentMethodCode": { "type": "string" }
          }
        },
        "sender": {
          "type": "object",
          "properties": {
            "phone": { "type": "string" },
            "email": { "type": "string", "format": "email" },
            "firstName": { "type": "string" },
            "lastName": { "type": "string" }
          }
        }
      }
    },
    "WebhookEvent": {
      "type": "object",
      "required": ["event", "uuid", "timestamp", "data"],
      "properties": {
        "event": { "type": "string", "enum": ["TRANSACTION", "SUBSCRIPTION", "PAYMENT_LINKS", "INVOICES"] },
        "uuid": { "type": "string", "format": "uuid" },
        "timestamp": { "type": "string", "format": "date-time" },
        "data": { "type": "object" }
      }
    }
  },
  "oneOf": [
    { "$ref": "#/definitions/Payment" },
    { "$ref": "#/definitions/Refund" },
    { "$ref": "#/definitions/Transfer" },
    { "$ref": "#/definitions/WebhookEvent" }
  ]
}