/// <summary>
/// Processes a payment request
/// </summary>
/// <param name="paymentModel"></param>
/// <returns></returns>
public async Task <IExecutionResponse <PaymentResult> > ProcessPaymentAsync(PaymentModel paymentModel)
{
_logger.LogInformation($"Processing payment...");
PaymentResult paymentResult;
string userName = GetLoggedInUser();
if (paymentModel.Amount < 0)
{
_logger.LogInformation("Cannot process payment for amounts less than 0");
paymentResult = PaymentResultMapping.CreateEntity(400, "An error occured");
return(_responseFactory.ExecutionResponse <PaymentResult>("Cannot process payment for amounts less than 0", paymentResult, statusCode: 400));
}
// Default result
PaymentResult thirdPartyResponse = new PaymentResult
{
Message = "An error occurred",
StatusCode = 500
};
if (paymentModel.Amount < 20)
{
// Use ICheapPaymentGateway. No retry
thirdPartyResponse = _cheapPaymentGateway.BankTransfer(paymentModel);
}
else if (paymentModel.Amount >= 21 && paymentModel.Amount <= 500)
{
// Use IExpensivePaymentGateway and retry once with ICheapPaymentGateway
thirdPartyResponse = RetryWithCheapPaymentGateway(paymentModel);
}
else if (paymentModel.Amount > 500)
{
// Use PremiumPaymentService and retry 3 times
thirdPartyResponse = RetryThriceWithPremiumGateway(paymentModel);
}
var payment = PaymentMapping.CreateEntity(paymentModel, userName, userName);
// Map response from third party
var paymentState = UpdatePaymentStateFromThirdParty(payment, thirdPartyResponse.StatusCode);
// Save to DB
_commandRepostory.Add(payment);
_paymentStateCommandRepostory.Add(paymentState);
await _commandRepostory.SaveAsync();
// Send thirdPartyResponse as the response data, in case an integrator wants to change transaction status based on status code
_logger.LogInformation("Payment processed successfully.");
return(_responseFactory.ExecutionResponse <PaymentResult>(thirdPartyResponse.Message, statusCode: thirdPartyResponse.StatusCode, data: thirdPartyResponse, status: true));
}
