{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/Payment",
  "title": "Payment",
  "type": "object",
  "description": "A payment resource tracking financial transactions and PSP interactions for an order.",
  "required": [
    "id",
    "version",
    "amountPlanned",
    "paymentMethodInfo",
    "transactions"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "System-generated unique identifier."
    },
    "version": {
      "type": "integer",
      "description": "Current version for optimistic concurrency control."
    },
    "key": {
      "type": "string",
      "description": "User-defined unique identifier."
    },
    "customer": {
      "$ref": "#/components/schemas/Reference"
    },
    "interfaceId": {
      "type": "string",
      "description": "Payment identifier as reported by the PSP."
    },
    "amountPlanned": {
      "$ref": "#/components/schemas/Money"
    },
    "paymentMethodInfo": {
      "$ref": "#/components/schemas/PaymentMethodInfo"
    },
    "paymentStatus": {
      "$ref": "#/components/schemas/PaymentStatus"
    },
    "transactions": {
      "type": "array",
      "items": {
        "$ref": "#/components/schemas/Transaction"
      },
      "description": "List of financial transactions associated with this payment."
    },
    "createdAt": {
      "type": "string",
      "format": "date-time",
      "description": "ISO 8601 timestamp when the payment was created."
    },
    "lastModifiedAt": {
      "type": "string",
      "format": "date-time",
      "description": "ISO 8601 timestamp when the payment was last modified."
    }
  }
}