/// <summary>
/// This sends the message back to PayPal which will reply with the verification status.
/// </summary>
/// <param name="ipnContext">The IPN Context message that was built by Process</param>
private void VerifyTask(ProcessedIPNMessage ipnContext)
{
try
{
var verificationRequest = WebRequest.Create(_IPNString);
//Set values for the verification request
verificationRequest.Method = "POST";
verificationRequest.ContentType = "application/x-www-form-urlencoded";
//Add cmd=_notify-validate to the payload
string strRequest = "cmd=_notify-validate&" + ipnContext.PayPalRequest.rawBody;
verificationRequest.ContentLength = strRequest.Length;
//Attach payload to the verification request
using (StreamWriter writer = new StreamWriter(verificationRequest.GetRequestStream(), Encoding.ASCII))
{
writer.Write(strRequest);
}
//Send the request to PayPal and get the response
using (StreamReader reader = new StreamReader(verificationRequest.GetResponse().GetResponseStream()))
{
ipnContext.VerificationString = reader.ReadToEnd();
}
}
catch (Exception exception)
{
throw new Exception(exception.ToString());
}
}
private void processData(PayPalIPNRequest requestData)
{
PPIPNProcessor processor = new PPIPNProcessor(true);
try
{
ProcessedIPNMessage result = processor.Process(requestData);
if (result.Verification == VerificationStatuses.Verified)
{
// check that Payment_status=Completed
// check that Txn_id has not been previously processed
// check that Receiver_email is your Primary PayPal email
// check that Payment_amount/Payment_currency are correct
// process payment
}
else if (result.Verification == VerificationStatuses.Invalid)
{
//Log for manual investigation Note that you WILL get this value if you are testing from local data as PayPal didn't initiate the transaction!
}
else
{
//Log error based on result.VerificationString value
Console.WriteLine(result.VerificationString);
}
} catch (Exception e)
{
// todo: log exception
}
}
/// <summary>
/// Pass in the request from PayPal and it will do the required reply back to PayPal asynch.
/// It then fires an event that your
/// </summary>
/// <param name="request"></param>
/// <returns>A ProcessedIPNMessage that contains the request plus the verification status as obtained
/// when we sent back the message to FaceBook</returns>
public ProcessedIPNMessage Process(PayPalIPNRequest request)
{
ProcessedIPNMessage ipnContext = new ProcessedIPNMessage();
ipnContext.PayPalRequest = request;
VerifyTask(ipnContext);
//Reply back with true
return(ipnContext);
}
