How to use the library after including it in composer?

Question

API

I need to get order information through the retailCRM API using composer, but I don't know how to use it.
The Readme file has an example with code on how to get info. about the order, but where to insert it and how to work is not indicated.
I would appreciate a specific code action plan, as well as links to composer articles for beginner programmers :)

Answer 1

Everything is very simple. If you are making a web application, then create a file in the root of the site (for example, retail.php). In which include the file autoload.php

<?php
require 'vendor/autoload.php';
?>

And that's it, you can use the API