You have to qualify for the shops and then if they are the mortage shops I am thinking of(that pay $150 here) you have to go back and forth with an agent to complete the shop and if you get disqualified at the wrong point then you don't get paid. It wasn't worth the hassle for me personally.
The only other shops I have seen for them around here(montana) are electronics audit shops that you have to pay out of pocket for a drug screen and background check and then after you complete I think 2 audits(not enough of them around here for that) you get paid back for the tests(which range around $50)...again not worth my time when I can do that same type of audit shops for other companies w/out needing background/drug tests. The only other shops I've seen were cell phone shops(mystery shops).
I haven't done any work for them but I did sign up. Find their site and sing up directly from there not from emails, then it secures against scams.