integrate mailchimp with laravel code example

Example 1: skovmand/mailchimp-laravel

This package is abandoned.
The Mailchimp API v2.0 was deprecated from jan 1st 2017. This package uses the
v2 API, because it relies on the Mailchimp PHP API Client, which uses the v2 
API.

Example 2: add subscribers from laravel to mailchimp

protected $listen = [
    'App\Events\UserRegistered' => [
        'App\Listeners\SubscribeToMailchimp',
    ],
];