Connection to a Website

Hello, I’m a french student and I have a project with some of my friends. We have to do a Smart Lock. The problem is my friend did a Website called ‘‘Smartlock’’ and I wanted to know if I create an account on the website for open the lock if I can connect the website to my mobile application created with AppInventor for. Imagine that you are creating an account on the website my question is can I also uses those account informations in the mobile application so If I can link by any way the website to the raspberry. (The website was made with HTML). Sorry for my bad english I hope that you could help me! :slight_smile: