If you expose your apex logic as Apex Invocable Methods, then you can call the logic through the “Run Custom Apex Action”. This approach is good if the Apex logic has a general purpose, such as “Send SMS via Twilio”, and thus should be available to call from any Skuid Page. You can lock down access to Invocable Apex Classes via Profile / Permission Sets, but not by execution context (e.g. VF Page), so If you need to lock down access to this Apex to be from a particular execution context, then the Remote Action approach would be better. 2. REST Models are a great alternative, yes! The nice thing about this approach is that you can then use regular Skuid Model API methods to, in effect, influence Apex code. Highly recommended.
