I originally picked this name because I was doing a lot of .NET and had multiple projects in the Clifton namespace (which is where I put all my personal library code)

Since there are other folks using this, it would be great to rename this to something more meaningful. Like PaymentHelper or something like that

The API stopped working last week, returning 500 Internal Server Error.
Contacted the Payeezy team yesterday, and they advised us to ensure HTTP headers we’re negotiating the connection with TLS 1.2 only.

Added the line below inside of CreateRequest function and it fixed the issue
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

Just a FYI, curious if there's any other ways to go around it.

Below is the link that notifies the enforcement of TLS v1.2
https://support.payeezy.com/hc/en-us/articles/115002769907-Payeezy-Gateway-Security-Protocol-Update-to-TLS-v1-2

Hi, first of all thank you so much for the code. It was all working fine until this morning when I tried to charge a payment on a car, I got the 500 error.
I tried opening a new test merchant account, to make sure there's nothing wrong from my end, but so far with no luck. I provided the error below, and hopefully this can help identify what the issue is.
Thank you,
Sean

{"Message":"An error has occurred.","ExceptionMessage":"The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.","ExceptionType":"System.Net.WebException","StackTrace":" at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)\r\n at System.Net.HttpWebRequest.GetRequestStream()\r\n at Clifton.Payment.Gateway.PayeezyGateway.CreateRequest(String apiKey, String apiSecret, String token, String url, String payloadString) in C:\Users\Administrator\Documents\FC\FC\Clifton.Payment\Gateway\Payeezy\PayeezyGateway.cs:line 95\r\n at Clifton.Payment.Gateway.PayeezyGateway.ProcessRequest(Object payload, String relativeUrl) in C:\Users\Administrator\Documents\FC\FC\Clifton.Payment\Gateway\Payeezy\PayeezyGateway.cs:line 175\r\n at System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)\r\n at Clifton.Payment.Gateway.PayeezyGateway.CreditCardPurchase(String cardNumber, String expirationMonth, String expirationYear, String dollarAmount, String cardHoldersName, String cardVerificationValue, String referenceNumber) in C:\Users\Administrator\Documents\FC\FC\Clifton.Payment\Gateway\Payeezy\PayeezyGateway.cs:line 266\r\n at FC.Controllers.CCPayeezyController.pay(PayeezyTransaction payload) in C:\Users\Administrator\Documents\FC\FC\Controllers\CCPayeezyController.cs:line 33\r\n at lambda_method(Closure , Object , Object[] )\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.b__9(Object instance, Object[] methodParameters)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ApiControllerActionInvoker.d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ActionFilterResult.d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext()","InnerException":{"Message":"An error has occurred.","ExceptionMessage":"The remote certificate is invalid according to the validation procedure.","ExceptionType":"System.Security.Authentication.AuthenticationException","StackTrace":" at System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken message, AsyncProtocolRequest asyncRequest, Exception exception)\r\n at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)\r\n at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)\r\n at System.Net.TlsStream.CallProcessAuthentication(Object state)\r\n at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)\r\n at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)\r\n at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)\r\n at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)\r\n at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size)\r\n at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size)\r\n at System.Net.ConnectStream.WriteHeaders(Boolean async)"}}

An exception keeps throwing saying that the year cannot be converted to a four digit year.

The CultureInfo appears to be incorrect. The argument should be "en-US" as opposed to just "US".

• Is it work with only credit cards and not debit cards?
• What if I want to save Credit Card information of a user on First data site?
• What if difference between Authorize, Capture, Purchase, Void and Refund?