Looking at the setup instructions for adding AppCheck, plus replay protection to cloud
functions, it looks to me like you should be able to simply add a wrapper around each
cloud function call, to implement said functionality. Ideally, just as I can enable AppCheck for my firestore database with a few clicks, I want to be able to enable AppCheck, for my cloud functions with a few clicks. Also, concomitantly add replay protection to cloud functions, as there's no significant downside to doing so..