The MailChimp Integration plugin 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.
Get the Plugin
WP-Members MailChimp Integration is a premium plugin available in the store.
Best Value: this plugin is included in the WP-Members Pro Bundle package.