Close Popup and Create Cookie After MailChimp with Popup Maker Submission
This solution works for Auto Open/Time Delay, Scroll, and Exit Intent Triggers.
Setup Your Cookie
After clicking Add, you will be able to customize every aspect of how your Cookie will behave. For detailed explanations on all of the Cookie Settings and features, check out the Cookie Settings and Features Doc.
Use the method documented here to create your Cookie on form submit.
Add the code below to either your parent (or child) theme's functions.php file, or within the 'My Custom Functions' plugin. The latter will preserve your custom code if your parent theme updates.