Paypal IPN no longer updating contributions
I'm not using this system, but I may have an explanation.  We use a custom coded donation system that expects PayPal to report back to us when there is a transaction.   On 7/26/17, 7/27, and 7/29 so far there have been no such transactions, on 7/28 we only received too.   The problem is confirmed to be a PayPal issue, and after fighting with them for 2 hours got a trouble ticket opened.  Log into PayPal and check your activity, then go to IPN (Instant Payment Notification Logs): https://www.paypal.com/us/cgi-bin/webscr?cmd=_display-ipns-history   If there is a problem communication with your site, it will show transactions that failed.  In my case, it clearly shows that PayPal is simply missing transaction entries under IPN that show up on the regular activity log.