Username/password from MT4/MT5 from/to MySQL database

I'm looking for a way to lock my MT4/MT5 software such that my subscribed members only have access so long as they are subscribed.  My website has a MySQL database.

Therefore, I need a mechanism where a user enters a username and password to access the .ex4/.ex5 file where the said username and password is matched within the MySQL database.  The username/password within the database should be able to be added/changed/removed on our end without the need for recompilation of the protected files.

There also needs to be a way to automatically issue a username/password when a new member subscribes and a way to delete their designated username/password when they unsubscribe.

In short, I need a mechanism to automatically protect my software where members can receive their credentials automatically, where I can have total control of access to the software, and former members lose access to the software upon unsubscribing.  There should be no manual "effort" in procuring or retracting the software and its access to members.