The MailChimp Integration extension is a premium extension for WP-Members that adds an additional settings tab for linking to a MailChimp list through the MailChimp API version 3.0.
It allows you to specify a subscription field, control if a double opt-in message is sent, and if WP-Members is set to approve registrations, it can hold MailChimp subscriptions until the user is approved.
Plugin InfoCurrent Stable Version: 2.0.3
Minimum WordPress Version: 3.6
Tested up to WordPress Version: 4.9.0