CreateTransactionRequest

{
    "amount": 1,
    "currency": "string",
    "payment_method": "string",
    "external_id": "string",
    "description": "string",
    "metadata": {
        "property1": "string",
        "property2": "string"
    },
    "callback_url": "http://example.com",
    "success_url": "http://example.com",
    "fail_url": "http://example.com"
}