Request phase and callback phase

[himanshu0128]

Hi, i really liked ueberauth strategies feature. I also checkout the sample example and it works fine. I am not able to customize the code though. I am having problem understanding whether how should i implement the request method as well as callback function. I could not find any documentation for same too. Do we need to manually call the outh url of the third app or does ueberauth does that for me?