Just wanted to give an update. I had given up on this and created my auth provider and it was a nightmare. Anyway, is it possible to extend or customize Keycloak so that user registration needs just a mobile number and a password generated by the server and sent to the user via SMS. Also, what's the best way to test a custom SPI? Does that mean we have to deploy it to Keycloak every time we want to test it? On Friday, September 16, 2016, 1:22:03 PM GMT+8, Francis Zabala <francis.zabala(a)yahoo.com&gt; wrote: Hello, What is the best setup to develop custom SPI for Keycloak. I just skimmed the example codes in github and wondered on how to test my codes. Not TDD way of testing but a simple, hey, will this run properly? Anyway, the reason I need to extend this is to create an authentication flow that will use your internal SMS api for subscriber verification. Regards,Francis