Double Opt In Setting Behavior

In the plugin's current state, it doesn't receive real-time webhooks when double opt-in is enabled or disabled from a Mailchimp list. The setting typically takes around 15 to 20 minutes to reflect the current flag.

As a workaround, if you would like to reset the current setting for double opt-in manually, you may append a query string to any URL with the addition of ?mc_doi_refresh=1. Doing so will update the most recent opt-in status from a Mailchimp list and checkouts will behave as expected.