Mailchimp Integration for Opt-in Popup

Last updated 11/20/2023

The Mailchimp Integration for Opt-in popup in WordPress allows you to add users to an audience in Mailchimp when they sign up using the Opt-in popup.

Follow these steps if you’re setting up Opt-in popup in WordPress, and need to enter the API Key and Audience ID.

Step 1

Log in to your Mailchimp Account.


Step 2

At the top right, click on your user account icon, then click Profile.


Step 3

Expand Extras, and select API keys.

Step 3

Step 4

Click Create a Key.

Step 4

Step 5

Copy and paste the key into the API Key field in the WordPress Opt-in popup page.

Step 5

Step 6

Next, go back to Mailchimp and click Audience, then All contacts on the left side menu.


Step 7

Select your audience, then go to Settings > Audience name and defaults. The Audience ID will be on the right side of the page.

Step 7

Step 8

Copy and paste the Audience ID into the field in the WordPress Opt-in popup page.

Step 8

Step 9

Click Save. You're all done! When any user signs up for the Opt-in popup, they'll be added to the audience you specified.



Don’t use Bread & Butter? Want to learn more about how Bread & Butter solves the four biggest problems facing marketers today? Book a demo and see how Bread & Butter is helping marketers make the most of their first-party data