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As a result, upon encountering this undeclared checked exception thrown by Retrofit's invocation handler, the framework throws an unchecked `UndeclaredThrowableException` that wraps around it instead, which the caller is not prepared to catch. This has the side-effect of disabling the error handling logic for the login request. This commit fixes the issue by declaring all the method definitions in `LoginService` to throw `RetroHttpException`.\r\n\r\nSome other refactoring has also been done as a result of this, and to clean up the login code. The details for that are in the commit messages.\r\n\r\n### Reviewers\r\nIf you've been tagged for review, please check your corresponding box once you've given the :+1:.\r\n- [x] Code review: @miankhalid \r\n- [x] Code review: 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