private void VerifyTask(IPNLocalContext ipnContext)
{
try
{
//var verificationRequest = System.Net.WebRequest.Create("https://ipnpb.sandbox.paypal.com/cgi-bin/webscr");
var verificationRequest = System.Net.WebRequest.Create("https://ipnpb.paypal.com/cgi-bin/webscr");
//Send response messages back to PayPal:
//https://ipnpb.sandbox.paypal.com/cgi-bin/webscr (for Sandbox IPNs)
//https://ipnpb.paypal.com/cgi-bin/webscr (for live IPNs)
//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.RequestBody;
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.Verification = reader.ReadToEnd();
}
}
catch (Exception ex)
{
PaypalErrors error = new PaypalErrors
{
Exception = ex.Message,
DateTime = DateTime.Now
};
_dbcontext.PaypalErrors.Add(error);
_dbcontext.SaveChanges();
}
ProcessVerificationResponse(ipnContext);
}
private void ProcessVerificationResponse(IPNLocalContext ipnContext)
{
if (ipnContext.Verification.Equals("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 (ipnContext.Verification.Equals("INVALID"))
{
//Log for manual investigation
}
else
{
//Log error
}
}
public async Task <IActionResult> Receive()
{
try
{
IPNLocalContext ipnContext = new IPNLocalContext()
{
IPNRequest = Request
};
using (StreamReader reader = new StreamReader(ipnContext.IPNRequest.Body, Encoding.ASCII))
{
ipnContext.RequestBody = reader.ReadToEnd();
}
//Store the IPN received from PayPal
await LogAndEmailRequest(ipnContext);
//React backend as per IPN Received
await UpdateSubscription(ipnContext);
//Fire and forget verification task
VerifyTask(ipnContext);
//Reply back a 200 code
return(Ok());
}
catch (Exception)
{
await EmailSuperAdmin(Request.ToString(), "IPN Send back PayPal failed");
PaypalErrors error = new PaypalErrors
{
Exception = Request.ToString(),
DateTime = DateTime.Now
};
_dbcontext.PaypalErrors.Add(error);
_dbcontext.SaveChanges();
return(Ok());
}
}
private async Task LogAndEmailRequest(IPNLocalContext ipnContext)
{
var sendEmailsAndLog = true;
// Persist the request values into a database or temporary data store
IPNContext ipn = new IPNContext
{
RequestBody = ipnContext.RequestBody,
Verification = ipnContext.Verification
};
if (ipn != null && ipn.RequestBody != null)
{
var response = ipn.RequestBody;
var keys = response.Split('&');
var data = new Dictionary <string, string>();
foreach (var key in keys)
{
//payment_type = instant
var field = key.Split('=');
data.Add(field[0], field[1]);
}
if (data["txn_type"] == "recurring_payment_profile_created")
{
if (data.ContainsKey("initial_payment_status"))
{
if (data["initial_payment_status"] == "Completed")
{
//do not send email
sendEmailsAndLog = true;
}
}
}
if (data["txn_type"] == "recurring_payment")
{
if (data.ContainsKey("payment_status"))
{
if (data["payment_status"] == "Completed")
{
//do not send email
sendEmailsAndLog = true;
}
}
}
//An existing customer has decided to cancel. Set Expiry date on the subscription.
if (data["txn_type"] == "recurring_payment_profile_cancel")
{
//do not send email
sendEmailsAndLog = true;
}
//An existing customer has SKIPPED their payment. NO ACTION REQUIRED AT THE MOMENT..
if (data["txn_type"] == "recurring_payment_skipped")
{
//do not send email
sendEmailsAndLog = true;
}
//A new customer tried to subscribed but their payment is PENDING. Delete their subscription on the website and on PayPal side.
if (data["txn_type"] == "recurring_payment_profile_created")
{
if (data.ContainsKey("initial_payment_status"))
{
if (data["initial_payment_status"] == "Pending")
{
//do not send email
sendEmailsAndLog = true;
}
}
}
if (sendEmailsAndLog)
{
//send email
var message = BuildEmailMessage(ipn);
var subject = BuildEmailSubject(ipn);
await EmailAdmin(message, subject);
_dbcontext.IPNContexts.Add(ipn);
_dbcontext.SaveChanges();
}
}
}
private async Task UpdateSubscription(IPNLocalContext ipn)
{
if (ipn != null && ipn.RequestBody != null)
{
var response = ipn.RequestBody;
var keys = response.Split('&');
var data = new Dictionary <string, string>();
foreach (var key in keys)
{
//payment_type = instant
var field = key.Split('=');
data.Add(field[0], field[1]);
}
//cancel Reversed transactions.
if (data.ContainsKey("payment_status"))
{
if (data["payment_status"] == "Reversed")
{
//update database
var payPalAgreement = data["recurring_payment_id"];
if (!String.IsNullOrEmpty(payPalAgreement))
{
await ReversedPaymentFound(payPalAgreement);
await TellPayPalToCancelSubscription(payPalAgreement);
}
}
}
if (data["txn_type"] == "recurring_payment_profile_created")
{
//A new customer tried to subscribed but their payment failed. Delete their subscription on the website and on PayPal side.
if (data.ContainsKey("initial_payment_status"))
{
if (data["initial_payment_status"] == "Failed")
{
//update database
var payPalAgreement = data["recurring_payment_id"];
if (!String.IsNullOrEmpty(payPalAgreement))
{
await NewSubscriptionFirstPaymentFailedDeleteSubscription(payPalAgreement);
await TellPayPalToCancelSubscription(payPalAgreement);
}
}
//A new customer has just successfully subscribed.
if (data["initial_payment_status"] == "Completed")
{
//update database for start date.
var payPalAgreement = data["recurring_payment_id"];
if (!String.IsNullOrEmpty(payPalAgreement))
{
await NewSubscriptionUpdateStartDate(payPalAgreement);
}
else
{
var type = data["txn_type"];
var status = data["initial_payment_status"];
await EmailSuperAdmin($"Null Agreement: IPN Type: {type} Payment Status : {status}", "Null Agreement");
}
}
//A new customer tried to subscribed but their payment is PENDING. Delete their subscription on the website and on PayPal side.
if (data["initial_payment_status"] == "Pending")
{
//update database
var payPalAgreement = data["recurring_payment_id"];
if (!String.IsNullOrEmpty(payPalAgreement))
{
await NewSubscriptionFirstPaymentPendingDeleteSubscription(payPalAgreement);
await TellPayPalToCancelSubscription(payPalAgreement);
}
}
}
}
////A new customer has just successfully subscribed.
//if (data["txn_type"] == "recurring_payment_profile_created")
//{
// if (data.ContainsKey("initial_payment_status"))
// {
// if (data["initial_payment_status"] == "Completed")
// {
// //update database for start date.
// var payPalAgreement = data["recurring_payment_id"];
// if (!String.IsNullOrEmpty(payPalAgreement))
// {
// await NewSubscriptionUpdateStartDate(payPalAgreement);
// }
// else
// {
// var type = data["txn_type"];
// var status = data["initial_payment_status"];
// await EmailSuperAdmin($"Null Agreement: IPN Type: {type} Payment Status : {status}", "Null Agreement");
// }
// }
// }
//}
////A new customer tried to subscribed but their payment is PENDING. Delete their subscription on the website and on PayPal side.
//if (data["txn_type"] == "recurring_payment_profile_created")
//{
// if (data.ContainsKey("initial_payment_status"))
// {
// if (data["initial_payment_status"] == "Pending")
// {
// //update database
// var payPalAgreement = data["recurring_payment_id"];
// if (!String.IsNullOrEmpty(payPalAgreement))
// {
// await NewSubscriptionFirstPaymentPendingDeleteSubscription(payPalAgreement);
// await TellPayPalToCancelSubscription(payPalAgreement);
// }
// }
// }
//}
//An existing customer has just renewed their subscription.
if (data["txn_type"] == "recurring_payment")
{
if (data.ContainsKey("payment_status"))
{
if (data["payment_status"] == "Completed")
{
//update database for start date.
var payPalAgreement = data["recurring_payment_id"];
if (!String.IsNullOrEmpty(payPalAgreement))
{
await NewSubscriptionUpdateStartDate(payPalAgreement);
}
}
}
}
//An existing customer has cancelled. Either Update or delete Subscription
if (data["txn_type"] == "recurring_payment_profile_cancel")
{
if ((!data.ContainsKey("initial_payment_status")))
{
if ((data.ContainsKey("profile_status")))
{
if (data["profile_status"] == "Cancelled")
{
var payPalAgreement = data["recurring_payment_id"];
//update profile and allow access until expired.
if (!String.IsNullOrEmpty(payPalAgreement))
{
await ExistingSubscriptionHasbeenCancelledUpdateSubscription(payPalAgreement);
}
else
{
var type = data["txn_type"];
var status = data["initial_payment_status"];
await EmailSuperAdmin($"Null Agreement: IPN Type: {type} Payment Status : {status}", "Update failed due to Null Agreement");
}
}
}
}
if ((data.ContainsKey("initial_payment_status")))
{
if (data["initial_payment_status"] == "Failed")
{
var payPalAgreement = data["recurring_payment_id"];
//ACTION : Remove subscription completly.
if (!String.IsNullOrEmpty(payPalAgreement))
{
await ExistingSubscriptionPaymentFailedUpdateSubscription(payPalAgreement);
}
else
{
var type = data["txn_type"];
var status = data["initial_payment_status"];
await EmailSuperAdmin($"Null Agreement: IPN Type: {type} Payment Status : {status}", "Delete failed due to Null Agreement");
}
}
}
}
//An existing customer has DENIED their payment. DEELTE Subscription.
if ((data["txn_type"] == "recurring_payment") && (data["payment_status"] == "Denied"))
{
//update database
var payPalAgreement = data["recurring_payment_id"];
if (!String.IsNullOrEmpty(payPalAgreement))
{
await ExistingSubscriptionPaymentHasbeenDeniedUpdateSubscription(payPalAgreement);
await TellPayPalToCancelSubscription(payPalAgreement);
}
}
//An existing customer has FAILED 3 PAYMENTS. Delete Subscription.
if (data["txn_type"] == "recurring_payment_failed")
{
//update database
var payPalAgreement = data["recurring_payment_id"];
if (!String.IsNullOrEmpty(payPalAgreement))
{
await ExistingSubscriptionPaymentFailedUpdateSubscription(payPalAgreement);
await TellPayPalToCancelSubscription(payPalAgreement);
}
}
//An existing customer has FAILED 3 PAYMENTS. Delete Subscription.
if (data["txn_type"] == "recurring_payment_suspended_due_to_max_failed_payment")
{
//update database
var payPalAgreement = data["recurring_payment_id"];
if (!String.IsNullOrEmpty(payPalAgreement))
{
await ExistingSubscriptionPaymentFailedMaxFailedPaymentsUpdateSubscription(payPalAgreement);
await TellPayPalToCancelSubscription(payPalAgreement);
}
}
//An existing customer has SKIPPED their payment. NO ACTION REQUIRED AT THE MOMENT..
if (data["txn_type"] == "recurring_payment_skipped")
{
// NO ACTION REQURIED.
}
}
}
