Welcome to the RingCentral Community

Hi @Nathan Douds Can you share which API you want to request out of the embeddable. For some commands, you can use embeddable's API directly https://github.com/ringcentral/ringcentral-embeddable/blob/master/docs/control-widget.md#control-widget

Any API request to RingCentral server require access token. Currently the embeddable saves access token in the iframe's local storage. You can only access that when you host the embeddable in the same domain. But it is not recommended to use token inside the embeddable, as the widget will refresh the token and expired old one.

If you want to request RingCentral API, It is better that you create another RingCentral RESTful app, and have another token management in the server side.