Auth.js method not supported anymore

I was running a server with genieacs version 1.1.3 and using auth.js connection method. Now I just installed a new server with version 1.2.9 and found out that auth.js is not supported any more.
How can I configure a connecction to genieacs 1.2.9 instead of auth.js

If only there was some way to search for the answer you seekā€¦