Hi there, I am using PayPal for User Upgrades. Everything seems to work just fine, the payments go through just fine and the user is upgraded correctly. But still, I am getting these e-mails from PayPal with regular intervals: At first I did not take any notice, since everything worked. But after about 10 days or receiving these notifications (one every 2-3 days). PayPal turned off IPN, and upgrades stopped working. I went in and turned it on again, and now it works.. but payPal has started sending me these e-mails again... so something does not seem to be right. From what I have read, the payback url is not used in Xenforo, but it is required in PayPal to be able to turn on IPN (see below). Ideas?