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https://github.com/tymondesigns/jwt-auth/issues/56
https://laracasts.com/discuss/channels/laravel/login-not-working-method-validate-does-not-exist
https://laracasts.com/discuss/channels/laravel/method-validate-does-not-exist-on-login
https://stackoverflow.com/questions/48235637/badmethodcallexception-method-username-does-not-exist
https://laravel.io/forum/badmethodcallexception-method-attempt-does-not-exist
https://www.computerbase.de/forum/threads/laravel-method-validate-does-not-exist.1554931/
https://ysk-override.com/Multi-Auth-in-Laravel-54-Login-20170203/
https://help.salesforce.com/HTViewSolution?id=000126959
https://readouble.com/laravel/5.4/en/validation.html
https://www.bountysource.com/issues/55606418-method-illuminate-auth-requestguard-attempt-does-not-exist
https://medium.com/@simonhamp/why-and-how-to-override-laravel-s-built-in-auth-controller-methods-60f070897ac6
https://archive.sap.com/discussions/thread/1182713
https://codeburst.io/api-authentication-in-laravel-vue-spa-using-jwt-auth-d8251b3632e0