public async Task <ResponseAPIModel> ProcessPayment([FromBody] ProcessPaymentAPIModel processPaymentModel)
{
using (PaymentEngine paymentEngine = new PaymentEngine())
{
return(await paymentEngine.ProcessPayment(processPaymentModel));
}
}
public ResponseAPIModel ProcessPayment(ProcessPaymentAPIModel paymentModel)
{
var client = new RestClient("http://localhost:52843/api/PaymentGateway/GetTransactions");
var request = new RestRequest(Method.POST);
request.AddHeader("cache-control", "no-cache");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("paymentModel", JsonConvert.SerializeObject(paymentModel), ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
return(JsonConvert.DeserializeObject <ResponseAPIModel>(response.Content));
}
public bool ValidatePaymentModel(ProcessPaymentAPIModel paymentModel, Logger logger)
{
//Simple model validation
//TO-DO: Add more robust one
if (paymentModel.MerchantId == null)
{
logger.Error("Merchant Id is null");
return(false);
}
if (paymentModel.CardNumber == null)
{
logger.Error("Card number is null");
return(false);
}
if (!IsValidCardNumber(paymentModel.CardNumber))
{
logger.Error("Card number is invalid");
return(false);
}
if (paymentModel.ExpiryDate < DateTime.Now)
{
logger.Error("Expiry date cannot be less than today's date");
return(false);
}
if (!isValidExpiryDate(paymentModel.ExpiryDate.ToString()))
{
logger.Error("Expiry date is invalid");
return(false);
}
if (paymentModel.ExpiryDate == null)
{
logger.Error("Expiry date is null");
return(false);
}
if (paymentModel.Amount < 1)
{
logger.Error("Amount cannot be negative");
return(false);
}
if (!ContainsNumbers(paymentModel.CVV))
{
logger.Error("CVV cannot contain alphabets");
return(false);
}
return(true);
}
private static ProcessPaymentModel BuildPaymentModel(ProcessPaymentAPIModel paymentModel)
{
logger.Info("Building payment process model");
return(new ProcessPaymentModel
{
MerchantId = paymentModel.MerchantId,
Amount = paymentModel.Amount,
CardNumber = EncryDecryMechanism.EncryptData(paymentModel.CardNumber, secretKey),
CVV = paymentModel.CVV,
Currency = paymentModel.Currency,
ExpiryDate = paymentModel.ExpiryDate
});
}
public async Task <ResponseAPIModel> ProcessPayment(ProcessPaymentAPIModel paymentModel)
{
//Serilog implementation
Log.Logger = new LoggerConfiguration()
.WriteTo.Console()
.WriteTo.Seq("http://localhost:5341")
.CreateLogger();
logger.Info("Starting Process Payment...");
Log.Information("Starting Process Payment...");
logger.Info("Validating process payment model");
Log.Information("Validating process payment model");
if (paymentModel != null && validator.ValidatePaymentModel(paymentModel, logger))
{
logger.Info("Valid payment model");
Log.Information("Valid payment model");
ProcessPaymentModel processModel = BuildPaymentModel(paymentModel);
//contact and expose data to external bank api
ExternalBankExpo contactExternalBank = new ExternalBankExpo();
logger.Info("Contacting external bank endpoints");
Log.Information("Contacting external bank endpoints");
try
{
var response = contactExternalBank.ProcessPayment(processModel);
if (response != null && response.ResponseStatus == States.Success.ToString())
{
logger.Info("Success in contacting external bank endpoints");
Log.Information("Success in contacting external bank endpoints");
//build transaction model and save data to db
Transaction transaction = BuildTransactionModel(processModel, response);
logger.Info("Attempting to save transaction");
Log.Information("Attempting to save transaction");
try
{
using (CheckOutPaymentGatewayEntities db = new CheckOutPaymentGatewayEntities())
{
db.Transactions.Add(transaction);
await db.SaveChangesAsync();
}
if (transaction.TransactionStatus == States.Success.ToString())
{
logger.Info("Transaction saved successfully");
}
else
{
logger.Error("Transaction failed");
}
return(transaction.TransactionStatus == States.Success.ToString() ? new ResponseAPIModel(States.Success)
: new ResponseAPIModel(States.Error, "Cannot execute transaction"));
}
catch (Exception ee)
{
logger.Error("Failed to contact perform transaction - " + ee.ToString());
Log.Information("Failed to contact perform transaction - " + ee.ToString());
}
}
else
{
logger.Error("Failed to contact external bank endpoints");
Log.Information("Failed to contact external bank endpoints");
return(new ResponseAPIModel(States.Error, "Cannot contact and process payment to external bank"));
}
}
catch (Exception e)
{
logger.Error("Failed to contact external bank endpoints - " + e.ToString());
Log.Information("Failed to contact external bank endpoints - " + e.ToString());
return(new ResponseAPIModel(States.Error, "Cannot contact and process payment to external bank"));
}
}
logger.Error("Invalid payment model");
Log.CloseAndFlush();
return(new ResponseAPIModel(States.Error, "Invalid payment api model"));
}
private void btnProcessPayment_Click(object sender, EventArgs e)
{
//DIRTY CODES AHEAD :D
if (tabControl1.SelectedTab == tabPage1)
{
ProcessPaymentAPIModel model = new ProcessPaymentAPIModel();
NumberStyles style = NumberStyles.Number | NumberStyles.AllowCurrencySymbol;
CultureInfo culture = CultureInfo.CreateSpecificCulture("en-GB");
decimal amount;
if (MerchantId.Text.Trim() == string.Empty || CardNumber.Text.Trim() == string.Empty ||
ExpiryDate.Text.Trim() == string.Empty || Amount.Text.Trim() == string.Empty ||
Currency.Text.Trim() == string.Empty || CVV.Text.Trim() == string.Empty)
{
MessageBox.Show("All fields are required for process the payment!");
return;
}
if (IsGuid(MerchantId.Text))
{
model.MerchantId = Guid.Parse(MerchantId.Text);
}
else
{
MessageBox.Show("Invalid Merchant Id!");
return;
}
if (IsValidCardNumber(CardNumber.Text))
{
model.CardNumber = CardNumber.Text;
}
else
{
MessageBox.Show("Invalid Card Number!");
return;
}
if (isValidExpiryDate(ExpiryDate.Text))
{
model.ExpiryDate = Convert.ToDateTime(ExpiryDate.Text);
}
else
{
MessageBox.Show("Invalid Expiry Date");
return;
}
if (Decimal.TryParse(Amount.Text, style, culture, out amount))
{
model.Amount = amount;
}
else
{
MessageBox.Show("Invalid Amount");
return;
}
//can add more validations...
model.Currency = Currency.Text;
model.CVV = CVV.Text;
var response = expo.ProcessPayment(model);
lblStatus.Text = !string.IsNullOrEmpty(response.ResponseMessage) ?
response.ResponseStatus.ToString() + " : " + response.ResponseMessage.ToString() : response.ResponseStatus.ToString();
}
}