How do I use dynamic variable inside PHP tags

Sorry @patrick, having a Friday afternoon nightmare. Yes, thanks for the reminder that App Connect works client-side. An important part that I had forgotten.

So if I follow @Teodor’s Using API Data Source tutorial then I should get somewhere should I?

Can I treat a PHP file in the same server space as an API? If so then I have never attempted this before, can you give some hints or guidance please based on the info above?