Mailchimp-api-php - another broken API request

The way to intialize the MailchimpLists has changed in version 3.0 - see https://github.com/thinkshout/mailchimp-api-php

See https://www.drupal.org/project/mailchimp/issues/3395363#comment-15282064 🐛 Error: Call to a member function request() on string in Mailchimp\MailchimpLists->getMemberInfo() Closed: works as designed as an example, but the following should work for your scenario

// Instantiate MailchimpApiInterface
$authentication_settings = [
  'api_key' => 'YOUR_API_KEY',
  'api_user' => 'api_key',
];

// Use Mailchimp class for api_key.
$api_class = new Mailchimp($authentication_settings);
$mc = new Mailchimp\MailchimpLists($api_class);
$list_id='abc';
$segments = $mc->getSegments($list_id);

Thanks @sagesolutions, this now works for me (after I'd added "use Mailchimp\Mailchimp;")

@dabley, good call. I've updated my comment :)