Hey - how's it going?
Just recently, in the last 7 days my cbsubs has suddenly started getting lots of Failed IPN notification... but I'm pretty sure nothing has changed anywhere.
IPN notification not authenticating at payment gateway INVALID
Paypal sent me an email saying that "Please check your server that handles PayPal Instant Payment Notifications (IPN). Instant Payment Notifications sent to the following URL(s) are failing:"
Whats even more strange is that inbetween the failed IPN are successful ones???
Any idea where I should look?
www.dropbox.com/s/spqm44giul0ipi2/cbsubs.png?dl=0
(These are all filtered to Paypal only)