How to use MailChimp Opt-in Checkbox
This feature was added to Contact Form 7 MailChimp Extension so you can give the option to your visitors to opt-in/opt-out to subscribe to your mailing list(s).
Using the Contact Form 7 MailChimp Extension Opt-in Checkbox feature, is super simple, please take a look a the screenshots below:
To achieve a form such as this one bellow:
Configure your form the same way you see it on this screenshot, add this code
[checkbox opt-in "Subscribe me your mailing list"]
Add it to my Contact Form 7 MailChimp Extension as in the screenshot bellow:
After these steps have been done, save your form and presto! you have an opt-in checkbox in the the front end of your form.
I hope this was a useful explanation of how to achieve a Contact Form 7 MailChimp Extension Opt-in Checkbox.