You don't EVER EVER EVER pay someone to let you work for them no matter how grand and special and wonderful they and their sycophants tell you they are. I've been a shopper for 15 years and hav never paid them, nor will I fill the pockets of the MSPA for these little certificates of theirs. Get signed up with legitimate mystery shopping companies, find shops through their job boards and go ahead and do the shops. Lists and paying fees is BS.
Her Serene Majesty, Cettie - Goat Queen of Zoltar, Sublime Empress of Her Caprine Domain