There's currently another thread regarding this, and also try using the search feature. Lots of feedback!
I was somehow flagged as a shopper, with one MSP, following which the scheduler advised I should have used a fake name, phone number, ordered different types of pizza each time, and paid with cash. That advice has served me well, with another MSP.
Also, pay close attention to how you take the photos. That's normally the reason of having a shop rejected. Correct angles, no time stamp, auto-focus is best, and - my favorite - no body parts in the picture.