How to call firebase/php-jwt class in Laravel 5

Currently I want to implement firebase/php-jwt into laravel 5

I've run the command composer require firebase/php-jwt under my laravel 5 project, and I get

"require": {
    ...
    "firebase/php-jwt": "^3.0"
},

in package.json

from config/app.php, I need inject this library, but don't know how to do.

via Chebli Mohamed