Not at all accurate
Ive attempted to use this several times, without much luck. Its told me business locations accept Apple Pay when they dont, and not informed me of at least one business that does accept Apple Pay. So in its current state, its not of much use...you still have to physically go check out each business personally, as you cant rely on this apps accuracy. Another issue I found is that if you want to add a business yourself, you have to actually be at that physical location to add it, since the app defaults to showing your phones current location and wont allow you to manually enter an address. This means you either remember to add, or rate, your Apple Pay experience while still physically at that location, or you cant do it at all, as theres no way to do so after leaving.
Morbius about
All Pay Locator