Memberium can be configured to keep a record of all HTTP POSTs sent to your site. The system collects the time, contact ID, and the result of the HTTP POST.
Below is an example of two results. The top entry is a makepass HTTP POST (password generation) that failed because the user already existed in WordPress and overwrite was off.
The second entry was an update contact HTTP POST that succeeded.
How to Enable
Enable the HTTP POST Log by going to Memberium > Settings > HTTP POSTs/Links…
The data is stored in a database table that you can access through normal tools, such as phpMyAdmin.