public bool ProcessProviderPayType(string merchantId, string cardNumber, string expiration,
decimal amount)
{
var provider = new StwipeProvider(merchantId);
return(provider.Pay(cardNumber, expiration, amount));
}
private static void MakeAPayment(StwipeProvider provider) //second change
{
provider.Pay("WERWERWER", "23", 200); //third change
}