Database minimum permissions
The user that is defined inside of the HNGamers Atavism Core module will be required to have certain permissions on the database tables for Atavism. Besides the permissions listed here, you will need to grant the following permission to the user.
GRANT INSERT ON master.account_purchases TO ‘yourusernamehere’@’%’;
Granting the insert permission will allow the plugin to process the request and properly insert the value. Look inside your PHP error log for information on the error failures that are occuring.