public async Task <PaymentResult> MakePayment(PaymentRequest paymentRequest)
{
//style -> RETURN errors as part of return value
PaymentResult result = new PaymentResult();
Payment payment = null;
//validate the accounts first
//these calls returning bool on validation
bool isValidAccount = await _bankClient.CheckAccount(paymentRequest.payee.accountNumber, paymentRequest.payee.ifscCode);
if (!isValidAccount)
{
result.SetResult(PaymentResult.ResultCodes.InvalidInput, PaymentResult.StatusCodes.InvalidPayeeAccount, null);
return(result);
}
isValidAccount = await _bankClient.CheckAccount(paymentRequest.beneficiary.accountNumber, paymentRequest.beneficiary.ifscCode);
if (!isValidAccount)
{
result.SetResult(PaymentResult.ResultCodes.InvalidInput, PaymentResult.StatusCodes.InvalidBeneficieryAccount, null);
return(result);
}
//a hard coded sample check representing a biz logic
if (paymentRequest.amount > 1000000)
{
result.SetResult(PaymentResult.ResultCodes.TransactionError, PaymentResult.StatusCodes.AmountExceedLimit, null);
return(result);
}
//create payment entry with initial status "InProgress"
payment = new Payment(paymentRequest.beneficiary.name, paymentRequest.beneficiary.accountNumber, paymentRequest.beneficiary.ifscCode,
paymentRequest.payee.name, paymentRequest.payee.accountNumber, paymentRequest.payee.ifscCode, paymentRequest.amount, PaymentStatus.InProgress);
_context.Payments.Add(payment);
await _context.SaveChangesAsync();
result.SetResult(PaymentResult.ResultCodes.InProgress, PaymentResult.StatusCodes.TransactionInitiated, payment);
//do the transaction
//debit payee
result.SetResult(PaymentResult.ResultCodes.InProgress, PaymentResult.StatusCodes.PayeeDebited, payment);
//credit beneficiary
result.SetResult(PaymentResult.ResultCodes.InProgress, PaymentResult.StatusCodes.BeneficiaryCredited, payment);
//update status in database
payment._status = PaymentStatus.Completed;
_context.Payments.Update(payment);
await _context.SaveChangesAsync();
result.SetResult(PaymentResult.ResultCodes.Success, PaymentResult.StatusCodes.TransactionInitiated, payment);
//return the payment result
return(result);
}
