You may receive the following email alert from Paypal :
Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing:
http://www.example.com/paypalipncallback.asp
If you do not recognize this URL, you may be using a service provider that is using IPN on your behalf. Please contact your service provider with the above information. If this problem continues, IPNs may be disabled for your account.
In latest version, we are no longer using paypalipncallback.asp for the Paypal callback.
In v7.02, v8.00 and v9.00, merchants do not need to set the Returl URL and Notification URL in their Paypal merchant account setting because VPCart already include these URLs parameters dynamically in the payment form eg:
<input name ="return" value ="http://www.yourvpcartsite.com/paypalresult.asp" type ="hidden">
<input name ="notify_url" value ="http://www.yourvpcartsite/paypalcallback.asp" type ="hidden">
Paypal sent you the email with the warning because your Notification URL is still storing the old url.
You may need to login to your Paypal merchant account to remove the old link http://www.example.com/paypalipncallback.asp or just change to use the correct one.
Please follow these steps :
1) Log in to your PayPal business account at www.paypal.com.
2) Mouse over to your profile menu on the top right, click Account Settings.
3) In the left panel, click Website payments.
4) Locate the "Instant payment notifications" section and click Update.
5) Click Choose IPN Settings to specify your listener's URL and activate the listener.
6. Specify the new URL for your listener in the Notification URL field :
http(s)://www.example.com/paypalcallback.asp
Then click option: Receive IPN messages (Enabled) to enable your listener.
8) Click Save.
Thank you.