You can expect the below object when you register a webhook for the following events:

card_transaction.create

Raw sample

{
  "kind": "purchase",
  "merchant_name_formatted": "ACQUIRER NAME",
  "amount_currency": "AED",
  "billing_amount_currency": "AED",
  "status": "success",
  "id": "CTX-9083E6F86A",
  "merchant_name": null,
  "amount": 100.0,
  "billing_amount": 100.0,
  "card": {
    "identifier": "CRD-40568CE75F",
    "card_name": "Phu's card test",
    "card_last4": "5178"
  },
  "card_holder": {
    "identifier": "MBOWNR-26027AA279",
    "fullname": "Dong Ngo",
    "email": "test@mamopay.com"
  },
  "created_at": "18 Dec 2025, 11:24AM",
  "updated_at": "18 Dec 2025, 11:24AM",
  "expense": {
    "status": "incomplete",
    "description": null,
    "invoice_number": null,
    "id": "EXP-BC62A49C41",
    "transaction": {
      "amount": 100.0,
      "amount_currency": "AED",
      "billing_amount": 100.0,
      "billing_amount_currency": "AED"
    },
    "card": {
      "identifier": "CRD-40568CE75F",
      "name": "Phu's card test",
      "last4": "5178"
    },
    "user": {
      "identifier": "MBOWNR-26027AA279",
      "fullname": "Dong Ngo",
      "email": "test@mamopay.com"
    },
    "category": null,
    "tax_code": null,
    "payment_account": null,
    "expense_account": null,
    "vendor": null,
    "receipt_uploaded": false,
    "created_at": "18 Dec 2025, 11:24AM",
    "updated_at": "18 Dec 2025, 11:24AM"
  },
  "event_type": "update"
}

Field Descriptions

Field	Type	Description
kind	String	Transaction type (`purchase`-`refund`-`withdrawal`)
merchant_name_formatted	String	Formatted merchant name
amount_currency	String	Transaction currency
billing_amount_currency	String	Billing currency
status	String	Transaction status (`success`-`declined`-`pending`)
card_last4	String	Last 4 digits of the card
id	String	Transaction ID
merchant_name	String	Raw merchant name
amount	Number	Transaction amount
billing_amount	Number	Billing amount
card_name	String	Card name/label
card_holder_name	String	Card holder name
created_at	String	Transaction creation date
updated_at	String	Transaction last update date
expense	Object	Associated expense details
expense.status	String	Expense status (`incomplete`-`pending_review`-`ready`-`synced`)
expense.description	String	Expense description
expense.invoice_number	String	Invoice number
expense.id	String	Expense ID
expense.category	String	Expense category
expense.tax_code	String	Tax code
expense.payment_account	String	Payment account
expense.expense_account	String	Expense account
expense.vendor	String	Vendor information
expense.receipt_uploaded	Boolean	Whether receipt is uploaded
expense.created_at	String	Expense creation date
expense.updated_at	String	Expense last update date
event_type	String	Corresponding Webhook Event