Here is an example of downloading the Stripe PHP library with Composer

https://github.com/stripe/stripe-php

  1. Install Composer.
    OSX/Linux/Unix
    https://getcomposer.org/doc/00-intro.md#installation-linux-unix-osx
    Windows
    https://getcomposer.org/doc/00-intro.md#installation-windows

  2. Create a composer.json file in your package root.

  3. Open composer.json and paste this code into it to declare your dependencies. The Composer dependencies will be listed on the GitHub project site, Packagist, or main project website.

    {
        "require": {
            "stripe/stripe-php": "2.*"
        }
    }
    
  4. Run Composer to download the dependencies.
    https://getcomposer.org/doc/00-intro.md#using-composer

  5. Once Composer finishes downloading, you will see a new folder called vendor and a new file called composer.lock.

  6. In your package controller, require the Composer autoloader inside the on_start() method, using $this->getPackagePath() for the path.

    public function on_start()
    {
        require $this->getPackagePath() . '/vendor/autoload.php';
    }
    

Now you should be able to create a new Stripe\Stripe object in local scope and \Stripe\Stripe object in global scope. Optionally, Composer can be used again in the future to update the dependencies to the current version.

composer.lock
This file locks the dependencies of your project to a known state. It is a list of the exact versions of the dependencies it installed in the vendor file.

vendor
The vendor folder contains all your dependencies, an autoload.php file, and a composer folder that contains additional autoload files.

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