If you already have our original Mailchimp integration connected to a form and you connect the MoonClerk Pro for Mailchimp extension to that same form, we will send in all of the data that comes with the extension into Mailchimp and sync it with Mailchimp for all checkouts moving forward. So, MoonClerk Pro for Mailchimp will essentially supersede our original Mailchimp integration on those forms after installation. 

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