{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://goodgo.vn/schemas/events/payment.completed.schema.json",
  "title": "payment.completed",
  "description": "Emitted when a Payment aggregate transitions to SUCCEEDED after a verified gateway IPN (VNPay / MoMo / ZaloPay).",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "paymentId",
    "orderId",
    "userId",
    "amount",
    "currency",
    "gateway",
    "gatewayTransactionId",
    "paidAt"
  ],
  "properties": {
    "paymentId": { "type": "string", "minLength": 1 },
    "orderId": { "type": "string", "minLength": 1 },
    "userId": { "type": "string", "minLength": 1 },
    "amount": {
      "type": "string",
      "pattern": "^-?\\d+(\\.\\d+)?$",
      "description": "Decimal as string to preserve VND precision (no float rounding)."
    },
    "currency": { "type": "string", "enum": ["VND", "USD"] },
    "gateway": { "type": "string", "enum": ["vnpay", "momo", "zalopay"] },
    "gatewayTransactionId": { "type": "string", "minLength": 1 },
    "paidAt": { "type": "string", "format": "date-time" }
  }
}