Toasts would appear on the Teachable checkout page due to the page using <iframes> to load in additional content such as your testimonials or 'here's more' type of content.

Witness treats <iframes> as the 'homepage' and would display in these containers.

The code has been updated to first check if the Toast will be loading inside of an <iframe> and if so, reject the request with a message "Witness does not run inside <iframes>'.