This action runs when a user does the payment complete.

 do_action('profilegrid_payment_complete',$gid,$user_id);

Simple example

function profile_magic_action_on_payment_complete($gid,$user_id)

{

//do something with the user id and group id when a user membership request is denied.

}

add_action( 'profilegrid_payment_complete', 'profile_magic_action_on_payment_complete');