public async Task <Either <ProcessPaymentResponseDTO, ErrorResponseDTO> > Handle(ProcessPaymentRequest request, CancellationToken cancellationToken)
{
// build a hashed key based on the values of the request
var requestCacheKey = BuildCacheKey(request);
// check if the cache already has this key, if so throw exception
if (_cache.TryGetValue(requestCacheKey, out _))
{
return(new ErrorResponseDTO
{
Message = "Multiple same requests detected",
StatusCode = HttpStatusCode.TooManyRequests
});
}
_logger.Information("Verifying payment with acquiring bank");
// use the acqbank to send payment
var bankResponse = await _acquiringBank.SendPayment(new AcquiringBankRequest
{
CardNumber = request.CardNumber,
Amount = request.Amount,
Currency = request.Currency,
CVV = request.CVV,
Expiry = request.Expiry
});
// save response to newPayment
var newPayment = new ProcessedPayment
{
Id = bankResponse.PaymentId,
PaymentResult = bankResponse.Status.ToString().Replace("_", " "),
// mask all but last 4 digits with *
CardNumber = new string('*', request.CardNumber.Length - 4) + request.CardNumber.Substring(request.CardNumber.Length - 4),
// mask full length with asterisks
CVV = new string('*', request.CVV.Length),
Expiry = new DateTime(request.Expiry.Year, request.Expiry.Month + 1, 1).AddDays(-1),
Amount = request.Amount,
Created = _nowProvider.Now,
Currency = request.Currency,
Owner = request.Owner
};
_logger.Information("Storing payment record with id {Id} for client {Owner}", newPayment.Id, newPayment.Owner);
// add new payment to DB
_context.ProcessedPayments.Add(newPayment);
await _context.SaveChangesAsync();
// add to cache, with TTL so it eventually is removed
// using this instead of .Set() so we can mock it easier
SetCacheForRequest(
requestCacheKey,
DateTimeOffset.UtcNow.AddMinutes(_cachingOptions.ProccessedPaymentTTLMinutes));
// return response dto with new payment id and result
return(new ProcessPaymentResponseDTO
{
PaymentId = newPayment.Id,
Success = bankResponse.Status == AcquiringBankResponseStatus.Success
});
}
public void GetProcessedPayment_ShouldWork_WhenSignatureIsValidAndPayIsNotPerformed()
{
var merchantParamenters = "eyJEc19EYXRlIjoiMTkvMDgvMjAxNSIsIkRzX0hvdXIiOiIxMjo0OSIsIkRzX0Ftb3VudCI6IjEyMzQ1IiwiRHNfQ3VycmVuY3kiOiI5NzgiLCJEc19PcmRlciI6Ijk5OTkxMTExMjIyMiIsIkRzX01lcmNoYW50Q29kZSI6IjAxMjM0NTYiLCJEc19UZXJtaW5hbCI6IjIiLCJEc19SZXNwb25zZSI6IjEwMSIsIkRzX01lcmNoYW50RGF0YSI6IiIsIkRzX1NlY3VyZVBheW1lbnQiOiIxIiwiRHNfVHJhbnNhY3Rpb25UeXBlIjoiMCIsIkRzX0NhcmRfQ291bnRyeSI6IiIsIkRzX0F1dGhvcmlzYXRpb25Db2RlIjoiMCIsIkRzX0NvbnN1bWVyTGFuZ3VhZ2UiOiIwIiwiRHNfQ2FyZF9UeXBlIjoiRCJ9";
string merchantKey = "Mk9m98IfEblmPfrpsawt7BmxObt98Jev";
string platformSignature = "iRNNn9pg2j6LIaLtlm15998hp/li7e2ptwVyfmO5JAY=";
IPaymentResponseService paymentResponseService = new PaymentResponseService();
ProcessedPayment result = paymentResponseService.GetProcessedPayment(merchantParamenters, merchantKey, platformSignature);
Assert.IsTrue(result.IsValidSignature == true);
Assert.IsFalse(result.IsPaymentPerformed.DefaultIfEmpty(false).Single());
Assert.IsNotNull(result.PaymentResponse);
Assert.IsTrue(result.PaymentResponse.Ds_Amount == 123.45M);
Assert.IsTrue(result.PaymentResponse.Ds_AuthorisationCode == "0");
Assert.IsTrue(result.PaymentResponse.Ds_Card_Country == "");
Assert.IsTrue(result.PaymentResponse.Ds_Card_Type == "D");
Assert.IsTrue(result.PaymentResponse.Ds_ConsumerLanguage == Language.Defect);
Assert.IsTrue(result.PaymentResponse.Ds_Currency == Currency.EUR);
Assert.IsTrue(result.PaymentResponse.Ds_Date == "19/08/2015");
Assert.IsTrue(result.PaymentResponse.Ds_Hour == "12:49");
Assert.IsTrue(result.PaymentResponse.Ds_MerchantCode == "0123456");
Assert.IsTrue(result.PaymentResponse.Ds_MerchantData == "");
Assert.IsTrue(result.PaymentResponse.Ds_Order == "999911112222");
Assert.IsTrue(result.PaymentResponse.Ds_Response == "101");
Assert.IsTrue(result.PaymentResponse.Ds_SecurePayment == "1");
Assert.IsTrue(result.PaymentResponse.Ds_Terminal == "2");
Assert.IsTrue(result.PaymentResponse.Ds_TransactionType == Enums.TransactionType.Authorization);
}
public void GetProcessedPayment_ShouldWork_WhenSignatureIsValidAndPayIsPerformed()
{
var merchantParamenters = "eyJEc19EYXRlIjoiMTkvMDgvMjAxNSIsIkRzX0hvdXIiOiIxMjo0OSIsIkRzX0Ftb3VudCI6IjEyMzQ1IiwiRHNfQ3VycmVuY3kiOiI5NzgiLCJEc19PcmRlciI6Ijk5OTkxMTExMjIyMiIsIkRzX01lcmNoYW50Q29kZSI6IjAxMjM0NTYiLCJEc19UZXJtaW5hbCI6IjIiLCJEc19SZXNwb25zZSI6IjAiLCJEc19NZXJjaGFudERhdGEiOiIiLCJEc19TZWN1cmVQYXltZW50IjoiMSIsIkRzX1RyYW5zYWN0aW9uVHlwZSI6IjAiLCJEc19DYXJkX0NvdW50cnkiOiIiLCJEc19BdXRob3Jpc2F0aW9uQ29kZSI6IjAiLCJEc19Db25zdW1lckxhbmd1YWdlIjoiMCIsIkRzX0NhcmRfVHlwZSI6IkQifQ==";
string merchantKey = "Mk9m98IfEblmPfrpsawt7BmxObt98Jev";
string platformSignature = "UpSJaiLH6mMZZkXQAyMgImD4LaJZLInbHaN7zzKbYr4=";
IPaymentResponseService paymentResponseService = new PaymentResponseService();
ProcessedPayment result = paymentResponseService.GetProcessedPayment(merchantParamenters, merchantKey, platformSignature);
Assert.IsTrue(result.IsValidSignature == true);
Assert.IsTrue(result.IsPaymentPerformed.DefaultIfEmpty(false).Single());
Assert.IsNotNull(result.PaymentResponse);
Assert.IsTrue(result.PaymentResponse.Ds_Amount == 123.45M);
Assert.IsTrue(result.PaymentResponse.Ds_AuthorisationCode == "0");
Assert.IsTrue(result.PaymentResponse.Ds_Card_Country == "");
Assert.IsTrue(result.PaymentResponse.Ds_Card_Type == "D");
Assert.IsTrue(result.PaymentResponse.Ds_ConsumerLanguage == Language.Defect);
Assert.IsTrue(result.PaymentResponse.Ds_Currency == Currency.EUR);
Assert.IsTrue(result.PaymentResponse.Ds_Date == "19/08/2015");
Assert.IsTrue(result.PaymentResponse.Ds_Hour == "12:49");
Assert.IsTrue(result.PaymentResponse.Ds_MerchantCode == "0123456");
Assert.IsTrue(result.PaymentResponse.Ds_MerchantData == "");
Assert.IsTrue(result.PaymentResponse.Ds_Order == "999911112222");
Assert.IsTrue(result.PaymentResponse.Ds_Response == "0");
Assert.IsTrue(result.PaymentResponse.Ds_SecurePayment == "1");
Assert.IsTrue(result.PaymentResponse.Ds_Terminal == "2");
Assert.IsTrue(result.PaymentResponse.Ds_TransactionType == Enums.TransactionType.Authorization);
}
public IProcessedPayment CreateProcessedPayment(IUnprocessedPayment unprocessedPayment, IAcquiringBankResponse acquiringBankResponse)
{
if (unprocessedPayment == null)
{
throw new ArgumentNullException(nameof(unprocessedPayment));
}
var processedPayment = new ProcessedPayment
{
Id = unprocessedPayment.Id,
CardNumber = unprocessedPayment.CardNumber,
CardCvv = unprocessedPayment.CardCvv,
CardExpiryMonth = unprocessedPayment.CardExpiryMonth,
CardExpiryYear = unprocessedPayment.CardExpiryYear,
Amount = unprocessedPayment.Amount,
Currency = unprocessedPayment.Currency,
UserId = unprocessedPayment.UserId,
User = unprocessedPayment.User,
CreatedAt = unprocessedPayment.CreatedAt
};
if (acquiringBankResponse == null)
{
return(processedPayment);
}
processedPayment.Success = acquiringBankResponse.Success;
processedPayment.AcquiringBankPaymentId = acquiringBankResponse.PaymentId;
return(processedPayment);
}
public ProcessedPayment GetProcessedPayment(string merchantParameters, string merchantKey, string providedSignature)
{
var paymentResponse = merchantParamentersManager.GetPaymentResponse(merchantParameters);
var expectedSignature = signatureManager.GetSignature(merchantParameters, paymentResponse.Ds_Order, merchantKey);
var isValidSignature = signatureComparer.ValidateResponseSignature(expectedSignature, providedSignature);
var result = new ProcessedPayment(paymentResponse, isValidSignature);
return(result);
}
public void GetProcessedPayment_ShouldWork_WhenSignatureIsNotValid()
{
var merchantParamenters = "eyJEc19EYXRlIjoiMTkvMDgvMjAxNSIsIkRzX0hvdXIiOiIxMjo0OSIsIkRzX0Ftb3VudCI6IjEyMzQ1IiwiRHNfQ3VycmVuY3kiOiI5NzgiLCJEc19PcmRlciI6Ijk5OTkxMTExMjIyMiIsIkRzX01lcmNoYW50Q29kZSI6IjAxMjM0NTYiLCJEc19UZXJtaW5hbCI6IjIiLCJEc19SZXNwb25zZSI6IjAiLCJEc19NZXJjaGFudERhdGEiOiIiLCJEc19TZWN1cmVQYXltZW50IjoiMSIsIkRzX1RyYW5zYWN0aW9uVHlwZSI6IjAiLCJEc19DYXJkX0NvdW50cnkiOiIiLCJEc19BdXRob3Jpc2F0aW9uQ29kZSI6IjAiLCJEc19Db25zdW1lckxhbmd1YWdlIjoiMCIsIkRzX0NhcmRfVHlwZSI6IkQifQ==";
string merchantKey = "Mk9m98IfEblmPfrpsawt7BmxObt98Jev";
string platformSignature = "xxxxxx";
IPaymentResponseService paymentResponseService = new PaymentResponseService();
ProcessedPayment result = paymentResponseService.GetProcessedPayment(merchantParamenters, merchantKey, platformSignature);
Assert.IsTrue(result.IsValidSignature == false);
Assert.IsFalse(result.IsPaymentPerformed.Any());
}
public async Task <SavePaymentResult> Save(ProcessedPayment processedPayment)
{
var paymentEntity = new PaymentEntity(
identityGenerator.NewId,
processedPayment.CardNumber,
processedPayment.ExpiryYear,
processedPayment.ExpiryMonth,
processedPayment.Amount,
processedPayment.Currency,
processedPayment.AcquirerPaymentId,
processedPayment.IsPaymentSuccessful);
db.Add(paymentEntity.Key, paymentEntity);
return(await Task.FromResult(new SavePaymentResult(paymentEntity.Key)));
}
public void ProcessedPayment_ShouldNotBePerformed_IfSignatureIsValidAndOrderHasNotBeenPaid()
{
ProcessedPayment processedPayment = new ProcessedPayment(Build.PaymentResponse(paid: false), true);
Assert.IsFalse(processedPayment.IsPaymentPerformed.DefaultIfEmpty(false).Single());
}
public void ProcessedPayment_ShouldNotHave_AnInvalidState()
{
ProcessedPayment processedPayment = new ProcessedPayment(Build.PaymentResponse(paid: true), false);
Assert.IsFalse(processedPayment.IsPaymentPerformed.Any());
}
private static void AssertFeeFields(string dateString, string merchantName, decimal paymentAmount, decimal expectedFeeAmount, ProcessedPayment processedPayment)
{
Assert.Equal(dateString, processedPayment.Date.ToString("yyyy-MM-dd"));
Assert.Equal(merchantName, processedPayment.MerchantName);
Assert.Equal(paymentAmount, processedPayment.Amount);
Assert.Equal(expectedFeeAmount, processedPayment.Fee);
}
private static void PrintProcessedPaymentFee(ProcessedPayment payment)
{
Console.WriteLine($"{payment.Date:yyyy-MM-dd} {payment.MerchantName} {String.Format("{0:0.00}", payment.Fee)}");
}
