I noticed over on https://github.com/opencart/opencart/issues/3657people are reporting issues with coupons and paypal standard flagging the fraud function. We don't have any issues with paypal pro when they use a credit card, and paypal standard works fine without coupons. When we try to mark the order completed, we get an HTTP 500 error.
More alarming we got this message today from Paypal:
Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing: https://.*****.com/index.php?route=exte ... 2Fcallback 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. Thank you for your prompt attention to this issue
Any suggestions? The coupon orders still go through, we just cannot change the order status on them in opencart using any method even if we click override.