Payment notification email is fired before or after mu-plugins function?

#1

I have Payment Notification email set, and also use the notification api to create a function that hooks into init inside mu-plugin/s2-hacks.php that changes the value of a custom field after each payment. I use Paypal and s2member pro.

My question is when the email is fired, is it before or after executing that function?

#2

Can not be before “init” hook… Try to find the sequence of firing the hooks with dome debug plugin like “Debug bar” or “Query monitor”.