Please guide me how can i use the upsrate api with this package

I have installed this package in my Laravel application ( https://github.com/ptondereau/Laravel-UPS-Api ) and supplied the required credentials into the usp.php file which exists in the config folder. now I want to use UPSrate now I am confused there is no code snippet to use where I can supply the package dimensions and other destination information please provide me a full-fledge code snippet that I can use in my Laravel application. thank you!