Once you configure double opt-in in Email Settings, Insider automatically generates a double optin event on the InOne panel. This event signals whether a double opt-in email should be sent to users who have recently registered on your website.
You can send this event to Insider using one of the following methods:
When the double optin event is sent to Insider, your users will start receiving emails to confirm their email addresses. When a user confirms their email address, the email double optin attribute will return true, and users will be eligible to receive emails from the Insider One's InOne panel.
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The double opt-in link does not expire by default. However, it will become invalid if you change the confirmation page URL in your settings.