public String ProcessPayment(PaymentDetails paymnetDetailsVO)
{
double amount_in_dbl;
double.TryParse(paymnetDetailsVO.Amount, out amount_in_dbl);
String transcation_result = null;
if (amount_in_dbl < 20)
{
// process with ICheapPaymentGatewayProvider
payment_gateway = new ICheapPaymentGatewayProvider();
transcation_result = payment_gateway.ProcessPayment(paymnetDetailsVO);
return(transcation_result);
}
else if (amount_in_dbl > 20 && amount_in_dbl <= 500)
{
// process with IExpensivePaymentGatewayProvider
payment_gateway = new IExpensivePaymentGatewayProvider();
transcation_result = payment_gateway.ProcessPayment(paymnetDetailsVO);
if (transcation_result.Equals(TransactionResult.TRANSACTION_FAIL))
{
// Transaction failed try with the cheapPaymentprovider Once
payment_gateway = new ICheapPaymentGatewayProvider();
transcation_result = payment_gateway.ProcessPayment(paymnetDetailsVO);
}
return(transcation_result);
}
else
{
// process with IPremiumPaymentGatewayProvider
payment_gateway = new IPremiumPaymentGatewayProvider();
transcation_result = payment_gateway.ProcessPayment(paymnetDetailsVO);
// Try thrice
for (int trial_attempts = 0; trial_attempts < 3; trial_attempts++)
{
if (transcation_result.Equals(TransactionResult.TRANSACTION_SUCCESS))
{
break;
}
}
return(transcation_result);
}
}
public static bool IsValidPaymentDataPosted(PaymentDetails paymentDetailVO)
{
if (ValidateString(paymentDetailVO.CreditCardNumber, paymentDetailVO.CardHolder, paymentDetailVO.Amount, paymentDetailVO.ExpirationDate))
{
if (IsValidCardNumber(paymentDetailVO.CreditCardNumber) &&
IsValidCardHolder(paymentDetailVO.CardHolder) &&
IsValidAmount(paymentDetailVO.Amount) &&
IsValidDate(paymentDetailVO.ExpirationDate) &&
IsValidSecurityCode(paymentDetailVO.SecurityCode))
{
return(true);
}
}
return(false);
}