{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://developer.nomba.com/schemas/nomba/webhook-event.json",
  "title": "Nomba Webhook Event",
  "description": "Schema for validating Nomba webhook event payloads delivered to merchant endpoints when subscribed events occur.",
  "type": "object",
  "required": ["event_type", "requestId", "data"],
  "properties": {
    "event_type": {
      "type": "string",
      "description": "The type of event that triggered the webhook notification.",
      "enum": [
        "payment_success",
        "payment_failed",
        "payout_success",
        "payout_failed",
        "order_success",
        "payment_reversal",
        "payout_refund"
      ]
    },
    "requestId": {
      "type": "string",
      "format": "uuid",
      "description": "A unique identifier for this webhook delivery request, useful for deduplication."
    },
    "data": {
      "type": "object",
      "description": "The event payload containing merchant, terminal, and transaction details.",
      "required": ["merchant", "transaction"],
      "properties": {
        "merchant": {
          "$ref": "#/$defs/Merchant"
        },
        "terminal": {
          "$ref": "#/$defs/Terminal"
        },
        "transaction": {
          "$ref": "#/$defs/Transaction"
        },
        "order": {
          "$ref": "#/$defs/Order"
        },
        "originalTransactionId": {
          "type": "string",
          "description": "The transaction ID of the original payment or payout for reversal and refund events."
        },
        "error": {
          "type": "string",
          "description": "A description of why the payment or payout failed, present on failure events."
        }
      }
    }
  },
  "$defs": {
    "Merchant": {
      "type": "object",
      "description": "Merchant account information associated with the event.",
      "properties": {
        "walletId": {
          "type": "string",
          "description": "The unique identifier for the merchant wallet."
        },
        "walletBalance": {
          "type": "number",
          "description": "The current wallet balance after the event occurred."
        },
        "userId": {
          "type": "string",
          "format": "uuid",
          "description": "The unique identifier of the merchant user."
        }
      }
    },
    "Terminal": {
      "type": "object",
      "description": "POS terminal information, populated for terminal-based transactions.",
      "properties": {
        "terminalId": {
          "type": "string",
          "description": "The unique identifier of the POS terminal."
        },
        "serialNumber": {
          "type": "string",
          "description": "The serial number of the POS terminal hardware."
        }
      }
    },
    "Transaction": {
      "type": "object",
      "description": "Transaction details for the event.",
      "properties": {
        "transactionId": {
          "type": "string",
          "description": "The unique identifier for the transaction."
        },
        "type": {
          "type": "string",
          "description": "The type of transaction, such as vact_transfer for virtual account transfers."
        },
        "aliasAccountNumber": {
          "type": "string",
          "description": "The alias account number associated with the transaction."
        },
        "amount": {
          "type": "number",
          "description": "The transaction amount."
        },
        "fee": {
          "type": "number",
          "description": "The fee charged for the transaction."
        },
        "sessionId": {
          "type": "string",
          "description": "The session identifier for the transaction."
        },
        "status": {
          "type": "string",
          "description": "The status of the transaction.",
          "enum": ["successful", "failed", "reversed", "refunded"]
        }
      }
    },
    "Order": {
      "type": "object",
      "description": "Checkout order information, present on order_success events.",
      "properties": {
        "orderReference": {
          "type": "string",
          "description": "The unique reference for the checkout order."
        },
        "amount": {
          "type": "number",
          "description": "The order amount."
        },
        "currency": {
          "type": "string",
          "description": "The currency of the order."
        }
      }
    }
  }
}