{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://developer.fiserv.com/schemas/fiserv/payment-transaction.json",
  "title": "Fiserv Payment Transaction",
  "description": "Schema representing a payment transaction across Fiserv payment processing APIs including CommerceHub and CardPointe Gateway.",
  "type": "object",
  "required": ["transactionId", "amount", "currency", "transactionType", "transactionState"],
  "properties": {
    "transactionId": {
      "type": "string",
      "description": "The unique identifier assigned to the transaction by the gateway."
    },
    "orderId": {
      "type": "string",
      "description": "The merchant-assigned order identifier."
    },
    "merchantId": {
      "type": "string",
      "description": "The merchant identifier."
    },
    "transactionType": {
      "type": "string",
      "enum": ["CHARGE", "AUTHORIZATION", "CAPTURE", "REFUND", "VOID", "VERIFICATION"],
      "description": "The type of transaction."
    },
    "transactionState": {
      "type": "string",
      "enum": ["AUTHORIZED", "CAPTURED", "SETTLED", "REFUNDED", "VOIDED", "DECLINED", "PENDING"],
      "description": "The current state of the transaction."
    },
    "amount": {
      "$ref": "#/$defs/Amount"
    },
    "currency": {
      "type": "string",
      "pattern": "^[A-Z]{3}$",
      "description": "The ISO 4217 three-letter currency code."
    },
    "paymentSource": {
      "$ref": "#/$defs/PaymentSource"
    },
    "processorResponse": {
      "$ref": "#/$defs/ProcessorResponse"
    },
    "billingAddress": {
      "$ref": "#/$defs/Address"
    },
    "createdAt": {
      "type": "string",
      "format": "date-time",
      "description": "The timestamp when the transaction was created."
    },
    "updatedAt": {
      "type": "string",
      "format": "date-time",
      "description": "The timestamp when the transaction was last updated."
    },
    "captureFlag": {
      "type": "boolean",
      "description": "Whether the transaction was captured immediately."
    },
    "settlementDate": {
      "type": "string",
      "format": "date",
      "description": "The date the transaction was settled."
    }
  },
  "$defs": {
    "Amount": {
      "type": "object",
      "description": "A monetary amount.",
      "required": ["total"],
      "properties": {
        "total": {
          "type": "number",
          "minimum": 0,
          "description": "The total amount."
        },
        "currency": {
          "type": "string",
          "pattern": "^[A-Z]{3}$",
          "description": "The ISO 4217 currency code."
        }
      }
    },
    "PaymentSource": {
      "type": "object",
      "description": "The payment source used for the transaction.",
      "properties": {
        "sourceType": {
          "type": "string",
          "enum": ["PaymentCard", "PaymentToken", "PaymentSession", "GooglePay", "ApplePay", "BankAccount"],
          "description": "The type of payment source."
        },
        "cardBrand": {
          "type": "string",
          "enum": ["VISA", "MASTERCARD", "AMEX", "DISCOVER", "JCB", "DINERS"],
          "description": "The card brand."
        },
        "maskedCardNumber": {
          "type": "string",
          "pattern": "^\\*{4,}\\d{4}$",
          "description": "The masked card number showing only the last four digits."
        },
        "expirationMonth": {
          "type": "string",
          "pattern": "^\\d{2}$",
          "description": "The card expiration month in MM format."
        },
        "expirationYear": {
          "type": "string",
          "pattern": "^\\d{4}$",
          "description": "The card expiration year in YYYY format."
        },
        "token": {
          "type": "string",
          "description": "The payment token if tokenized."
        }
      }
    },
    "ProcessorResponse": {
      "type": "object",
      "description": "The response from the payment processor.",
      "properties": {
        "approvalStatus": {
          "type": "string",
          "enum": ["APPROVED", "DECLINED", "PROCESSING_FAILED", "RETRY"],
          "description": "The approval status."
        },
        "approvalCode": {
          "type": "string",
          "description": "The issuer approval code."
        },
        "responseCode": {
          "type": "string",
          "description": "The processor response code."
        },
        "responseMessage": {
          "type": "string",
          "description": "The human-readable response message."
        },
        "avsResponseCode": {
          "type": "string",
          "description": "The Address Verification System response code."
        },
        "cvvResponseCode": {
          "type": "string",
          "description": "The Card Verification Value response code."
        }
      }
    },
    "Address": {
      "type": "object",
      "description": "A physical or billing address.",
      "properties": {
        "line1": {
          "type": "string",
          "maxLength": 255,
          "description": "Address line 1."
        },
        "line2": {
          "type": "string",
          "maxLength": 255,
          "description": "Address line 2."
        },
        "city": {
          "type": "string",
          "maxLength": 100,
          "description": "The city."
        },
        "state": {
          "type": "string",
          "maxLength": 100,
          "description": "The state or province."
        },
        "postalCode": {
          "type": "string",
          "maxLength": 20,
          "description": "The postal or ZIP code."
        },
        "country": {
          "type": "string",
          "pattern": "^[A-Z]{2}$",
          "description": "The ISO 3166-1 alpha-2 country code."
        }
      }
    }
  }
}