CreateWithdrawalDto

{
    "amount": "100.00",
    "currency": "USDT",
    "paymentMethod": "card",
    "userId": "user-123",
    "merchantOperationId": "merch-op-002",
    "callbackUrl": "https://example.com/callback",
    "requisites": {},
    "userData": {
        "email": "user@example.com",
        "phone": "+1234567890",
        "ipAddress": "192.168.1.1",
        "firstName": "John",
        "lastName": "Doe"
    }
}