https://www.gravityforms.com/add-ons/mailchimp/

Directly integrate your forms with MailChimp to gain more mailing list subscribers. With Gravity Forms and the MailChimp add-on, every form on your WordPress site becomes a potential subscriber! Packed with features and incredibly easy to use, we know you'll fall in love with Gravity Forms just like millions of companies worldwide have.

Changelog

- Updated feed processing to include the tags in the request to the add/update member endpoint instead of making a separate request to the member tags endpoint.

- Fixed an issue where an "Unable to add/update subscriber: Invalid Resource" error occurs when mapped field values include HTML entities.

- Fixed a `Using ${var} in strings is deprecated, use {$var} instead` deprecation notice with PHP 8.2.

- Fixed an error where the Mailchimp connection alerts appear when attempting to connect other add-ons.