API Payment Notifications triggered twice

Hello,

I use the Payment Notification URLs for generating an invoice. But since the latest update that I performed today, this event is triggered twice and therefore my invoice generation function is triggered twice with every signup..

Do you have any idea what the reason might be or how I can fix this?

Thank you!

Here is how my notification url looks:

http://www.mywebsite.com/?invoice_gen=wap66thesta2utEc&trans_id=%%txn_id%%&desc=%%item_name%%&preis=%%amount%%&id=%%user_id%%

After several re- and un-installations I think I found the problem. The plugin w3 total cache seems to be the reason for the double trigger of the notification.

Are there any incompatibilities of s2member with this plugin known?

Best Regards

Are there any incompatibilities of s2member with this plugin known?

W3TotalCache’s Object Caching is known to cause issues with s2Member’s IPN handler. We recommend switching to Quick Cache, as we know that it works correctly with s2Member because we wrote it. :)

See: Knowledge Base » Plugins/Themes (Compatibility w/ s2Member®)