1. Prerequisites

This PHP library will need to be running with at least PHP version 7.1 or higher. You can make sure about this by adding following to your composer.json file (composer require php doesn’t work).

{
    "require": {
        "php": ">=7.1"
    }
}

With that requirement set, you can now add the library itself.

composer require d3strukt0r/oauth2-openid