In the last few weeks my notifications have more or less completely stopped, as far as I can remember I didn't change anything. I checked GetNotificationPreferences and the information there seems correct. Then trying GetNotificationsUsage with an item id I can see errors in there as follows:
ErrorMessage: DELIVERY_HTTP_SEND_FAILURE:[Notification HttpEventSender: URL https://etc.etc/myscript.php: HTTP Client returned '500' (HTTP status: 500, 'Internal Server Error')]
Is that something going wrong on my server or is that a problem at ebay's end? - The URL for the php is correct and when I access it directly in a browser it returns status 200.
Thanks for any help!