Many Android apps request an account to use it, and many have the possibility to login via Google, Facebook, Twitter, etc via a button. Sometimes the apps have a desktop website and usually those websites have the same social login buttons to be able to login... but, what if those buttons are not present?
For example, I use Uber app in an Android smartphone, I login using the Google button, but their desktop websites does not feature the Google button, thus I can't login. How to do it?
Specifically, is it possible to login to websites without using those OpenID buttons that had been used before?