title: Play authenticate plugin - providers
body: <p>I'm using Play authenticate plugin but I have no foggiest idea how to provide custom authentication with login &amp; password. I.e. before I've started using the plugin I'd built up the whole authentication module and I would like to incorporate it into the plugin.</p>
  
  <p>There's neither any documentation nor tutorial on this subject and I don't really understand 
  how the sample code works:
  <a href="https://github.com/joscha/play-authenticate/tree/master/samples/java/play-authenticate-usage/app/providers" rel="nofollow">https://github.com/joscha/play-authenticate/tree/master/samples/java/play-authenticate-usage/app/providers</a></p>
  
  <p>My goal is just to check if provided login &amp; password are matching one of entries in database, using previously written methods. Please, help me.</p>