Complaint / Review
Servicecheck.com
Here's a company not to work for—they refuse to pay based on their idea of lack of information

This company will let you do mystery shopping for them, but they demand too many details be written down to get paid. No one can memorize that much information and you cannot take the forms into stores with you to note things because then the store people will know you are a mystery shopper.

So basically they will have do work for free for them, even if you have noted plenty of details.