public async Task <Payment> CapturePayment(Payment payment, TransactionUpdateDetails details)
{
if (payment.CreditCardDetails.CreditCardNumber == 4000000000000259)
{
throw new PaymentGatewayServiceException("Invalid credit card number for Capture");
}
// Would these checks into a rule engine but for now hard coding due to time constaints
if (payment.IsVoid)
{
throw new InvalidTransactionCaptureException("Payment is already void so should not capture", payment.Id);
}
;
if (payment.TransactionRefundDetails != default)
{
throw new InvalidTransactionCaptureException("Payment has been refunded", payment.Id);
}
if (details.Amount < 0)
{
throw new InvalidTransactionCaptureException("Amount can not be less than 0", payment.Id);
}
if (payment.PaymentCompletedDate != DateTime.MinValue)
{
throw new InvalidTransactionCaptureException("Payment has been fully paid", payment.Id);
}
if (payment.TransactionCaptureDetails == default)
{
payment.TransactionCaptureDetails = new List <TransactionUpdateDetails>
{
details
};
}
else
{
payment.TransactionCaptureDetails.Add(details);
}
var paidAmount = payment.TransactionCaptureDetails.Sum(x => x.Amount);
if (payment.TransactionDetails.Amount - paidAmount < 0)
{
throw new InvalidTransactionCaptureException("Transaction will take total amount greater than what customer owes", payment.Id);
}
if (payment.TransactionDetails.Amount == paidAmount)
{
_logger.LogInformation("Payment amount owed is now 0. Do not capture any more money");
payment.PaymentCompletedDate = DateTime.UtcNow;
}
return(await _repository.Update(payment));
}
public async Task <Payment> RefundPayment(Payment payment, TransactionUpdateDetails details)
{
if (payment.CreditCardDetails.CreditCardNumber == 4000000000003238)
{
throw new PaymentGatewayServiceException("Invalid credit card number for Refund");
}
if (payment.TransactionRefundDetails == default)
{
payment.TransactionRefundDetails = new List <TransactionUpdateDetails>
{
details
};
}
else
{
payment.TransactionRefundDetails.Add(details);
}
var refundAmount = payment.TransactionRefundDetails.Sum(x => x.Amount);
decimal totalAmountCaptured = 0m;
if (payment.TransactionCaptureDetails != default)
{
totalAmountCaptured = payment.TransactionCaptureDetails.Sum(x => x.Amount);
}
if (totalAmountCaptured - refundAmount < 0)
{
throw new InvalidTransactionCaptureException("This refund will give the customer back more than they paid", payment.Id);
}
if (totalAmountCaptured == refundAmount)
{
_logger.LogInformation($"Full payment has been refunded {payment.Id}");
payment.PaymentCompletedDate = DateTime.UtcNow;
}
return(await _repository.Update(payment));
}
