I installed Pro Sites v. 3.0.3 on our test site over a week ago and just received this message from PayPal today:
Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing:
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.
I have confirmed the IPN url is entered exaclty as it is shown in my Pro Sites settings, and that admin-ajax.php is in the wp-admin directory but I searched that file and did not find any psts_pypl_ipn action? Am I doing something wrong? Why would I get this IPN error? Will it affect my PayPal payments from buttons on other sites?
Registration is turned off on the site since I use it only for testing purposes. I have received payments from other sources prior to receiving this message, but not since. Thais may just be a coincidence but I'd love some advice as to how I should address this issue.