/// <summary>
/// make payment at payment gateway api
/// </summary>
/// <param name="processPaymentViewModel"></param>
/// <returns></returns>
private async Task <string> MakePayment(ProcessPaymentViewModel paymentViewModel)
{
//TO DO: make payment using payment gateway API
switch (paymentViewModel.PaymentGatewayId)
{
case 1: //CheapPaymentGateway
break;
case 2: //ExpensivePaymentGateway
break;
case 3: //PremiumPaymentGateway
break;
default:
break;
}
return(Extentions.GetDescription(EnumClass.PaymentResponse.Processed));
}
public async Task <ProcessPaymentViewModel> ProcessPayment(ProcessPaymentViewModel paymentViewModel)
{
paymentViewModel.messageViewModel = new MessageViewModel();
paymentViewModel.messageViewModel.Status = true;
if (paymentViewModel.Amount < 0) //The request is invalid: 400 bad request
{
paymentViewModel.messageViewModel.Status = false;
paymentViewModel.messageViewModel.Message = Extentions.GetDescription(EnumClass.PaymentResponse.InvalidRequest);
return(paymentViewModel);
}
try
{
#region local variables
string paymentGateway = string.Empty;
int retryPayment = 0;
string paymentGatewayResponse = Extentions.GetDescription(EnumClass.PaymentResponse.Processed);
PaymentDetailModel paymentDetailModel = new PaymentDetailModel();
PaymentDetailModel _paymentDetailModel = new PaymentDetailModel();
UsersCreditCardDetailModel usersCreditCardDetailModel = new UsersCreditCardDetailModel();
bool isCardValid = true;
#endregion local variables
#region choose payment gateway
if (paymentViewModel.Amount <= 20) //If the amount to be paid is less than £20, use ICheapPaymentGateway.
{
paymentViewModel.PaymentGatewayName = Extentions.GetDescription(EnumClass.PaymentGateways.CheapPaymentGateway);
paymentViewModel.PaymentGatewayId = (int)EnumClass.PaymentGateways.CheapPaymentGateway;
}
else if (paymentViewModel.Amount > 20 && paymentViewModel.Amount <= 500) //If the amount to be paid is £21 - 500, use IExpensivePaymentGateway
{
paymentViewModel.PaymentGatewayName = Extentions.GetDescription(EnumClass.PaymentGateways.ExpensivePaymentGateway);
paymentViewModel.PaymentGatewayId = (int)EnumClass.PaymentGateways.ExpensivePaymentGateway;
//use IExpensivePaymentGateway if available. Otherwise, retry only once with ICheapPaymentGateway.
if (!ValidatePaymentGateway(paymentViewModel.PaymentGatewayName))
{
paymentViewModel.PaymentGatewayName = Extentions.GetDescription(EnumClass.PaymentGateways.CheapPaymentGateway);
if (!ValidatePaymentGateway(paymentViewModel.PaymentGatewayName)) //Any error: 500 internal server error
{
paymentViewModel.messageViewModel.Status = false;
paymentViewModel.messageViewModel.Message = Extentions.GetDescription(EnumClass.PaymentResponse.Failed);
return(paymentViewModel);
}
}
}
else //If the amount is > £500, try only PremiumPaymentService
{
paymentViewModel.PaymentGatewayName = Extentions.GetDescription(EnumClass.PaymentGateways.PremiumPaymentGateway);
paymentViewModel.PaymentGatewayId = (int)EnumClass.PaymentGateways.PremiumPaymentGateway;
}
#endregion choose payment gateway
#region Validate & Save new CC detail
//validate card
isCardValid = ValidateCreditCard(paymentViewModel);
//return here if CC detail is not valid
if (!isCardValid) //400 bad request : Invaild Card Detail
{
paymentViewModel.messageViewModel.Status = isCardValid;
paymentViewModel.messageViewModel.Message = Extentions.GetDescription(EnumClass.PaymentResponse.InvaildCardDetail);
return(paymentViewModel);
}
//save card detail into database
usersCreditCardDetailModel = await SaveUserCCDetail(paymentViewModel);
if (usersCreditCardDetailModel == null)
{
paymentViewModel.messageViewModel.Status = false;
paymentViewModel.messageViewModel.Message = Extentions.GetDescription(EnumClass.PaymentResponse.Failed);
return(paymentViewModel);
}
#endregion Save/Update CC detail
#region make payment
//get payment gateway response
paymentGatewayResponse = await MakePayment(paymentViewModel);
#endregion make payment
#region Save payment detail
paymentDetailModel.Amount = paymentViewModel.Amount;
paymentDetailModel.CCUsed = usersCreditCardDetailModel;
paymentDetailModel.PaymentDate = DateTime.UtcNow;
paymentDetailModel.CartId = paymentViewModel.CartId;
paymentDetailModel.PaymentGateway = paymentViewModel.PaymentGatewayName;
paymentDetailModel.PaymentStatus = paymentGatewayResponse;
await _unitOfWork.PaymentDetailModelRepository.InsertAsync(paymentDetailModel);
_paymentDetailModel = _mapper.Map <PaymentDetailModel>(paymentDetailModel);
#endregion Save payment detail
#region check payment status and update entity as completed
//If the amount is > £500, try only PremiumPaymentService and retry up to 3 times in case payment does not get processed
while (paymentViewModel.Amount > 500 &&
paymentGatewayResponse != Extentions.GetDescription(EnumClass.PaymentResponse.Processed))
{
if (ValidatePaymentGateway(paymentViewModel.PaymentGatewayName))
{
paymentGatewayResponse = await MakePayment(paymentViewModel);
}
if (retryPayment == 3 || paymentGatewayResponse == Extentions.GetDescription(EnumClass.PaymentResponse.Processed))
{
break;
}
retryPayment = retryPayment + 1;
}
//Store/update the payment and payment state entities created previously once the processing is completed
if (paymentDetailModel.PaymentStatus == Extentions.GetDescription(EnumClass.PaymentResponse.Processed))
{
//Use of eager loading
var paymentDetail = _unitOfWork.PaymentDetailModelRepository.FindAllByQuery(c => c.Id == paymentDetailModel.Id)
.Include(c => c.CCUsed)
.FirstOrDefault();
paymentDetail.PaymentStatus = Extentions.GetDescription(EnumClass.PaymentResponse.Completed);
await _unitOfWork.PaymentDetailModelRepository.UpdateAsync(paymentDetail);
}
#endregion check payment status
paymentViewModel.messageViewModel.Id = paymentDetailModel.Id;
paymentViewModel.messageViewModel.Message = paymentGatewayResponse; //200 Ok
}
catch (Exception ex) //500 internal server error
{
paymentViewModel.messageViewModel.Status = false;
paymentViewModel.messageViewModel.Message = Extentions.GetDescription(EnumClass.PaymentResponse.Failed);
}
return(paymentViewModel);
}