Simple MailChimp API Wrapper
composer require devlib/mailchimp-api
use DevLib\API\MailChimp\MailChimp;
$apiKey  = getenv('MC_API_KEY');
$list_id = getenv('MC_LIST_ID');
$api     = new MailChimp($apiKey, $list_id);use DevLib\API\MailChimp\MailChimp;
use MailChimpAPIException
$email = 'you@example.com';
try{
    $api->subscribe($email, [
        'FNAME' => 'Emma',
        'LNAME' => 'Doe'
    ]);
}catch(MailChimp\MailChimpAPIException $e){
    echo ( 'Error: ' . $e->getMessage() );
}