Laravel 5 Guzzle API

I am confused with the usage of Guzzle in a scalable way. I have installed Guzzle in my Laravel 5.5 Project. Also, I have added a new File ApiBridge in app folder. Then in my Controller, I used this file.

Can anyone tell me how I can use the Apibridge file to generate the access token and send a CURD request in the most scalable way? I know we can use new Client([base_uri:..]). But I don't want to give the URL every time in all controllers.

via Chebli Mohamed