PPTP using MySQL Authentication

Please read and understand first before you bid this project. I have VPS with OpenVPN installed and it's running good. The OpenVPN access is authenticate using MySQL. All the details of the users are saved inside the database (username, password,, etc). So right here I would like to install the PPTP alongside the OpenVPN. I managed to install it and get it working already. However, the authentication of that PPTP is only based on username & password (in chap-secrets file) I try to have PPTP working like OpenVPN. The sequence should be like this: 1. User try connect to the server through PPTP 2. The server send a request to a website with POST request with username, password, server type, server ip, user ip etc... 3. If all the details are true, and everything is valid the user can connect. The server-side (web-server) is ready. Server needs post datas then returns with a json. I've heard that we can use Radius to authenticate PPTP using MySQL, but I have custom ideas I think radius wont fits. Basically I would need someone to make the above request. Preferred programming lang is python.