When you're setting up the Clipchamp API, you might be seeing the following error message in your code:
Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('https://api.clipchamp.com') does not match the recipient window's origin ('https://your.domain').
This error message stems from the solution we implemented to an inherent race condition when the browser is loading the Clipchamp code. It does not affect setting up the Clipchamp API and getting user-generated videos delivered correctly.
Unfortunately, it is a message we cannot suppress even though it is not causing any problems during setup or running of the Clipchamp button.