I'm happy to say I just got approved as a mystery shopper and have my first assignment. They'll be sending me a packet and the funds to complete the survey.
It took about 4 months for my background checks to be completed, but I got approved. Woo-hoo!
This sounds like a great WAH job!
Edit: Never mind. I went to the MSPA website and found out it was a scam email I received.