One-click cancel links
The one-click cancel merge tags allow assignees to cancel the workflow for the entry by clicking on a link in an email. They can be added to any of the workflow messages. The inbox shortcode must be on a WordPress page.
{workflow_cancel_link}
You'll need to set the default inbox page in the settings or add the page_id attribute to the merge tag like this:
{workflow_cancel_link:page_id=[ID]} e.g. {workflow_cancel_link:page_id=5}
You can find the page ID in the URL of the page when you're editing the WordPress page. The page_id is the 'post_id' parameter in the URL.
You can construct your own links by using the URL equivalents:
{workflow_cancel_url:page_id=[ID]}
Adjust the text in the link using the text attribute:
{workflow_cancel_url:page_id=[ID] text="Unsubscribe"}