Always being declined

It may have something to do with your profile? So far I've requested 5 shops total, and I've been accepted for 3 of them--one of them being an audit, not a secret shop. I know that, depending on the situation, certain demographics are required for certain jobs. Don't give up, keep requesting, and your bound to get accepted eventually. In the mean time, look back over your profile and make sure there are no errors either in Grammer and/or accuracy and upload a professional looking profile picture. Maybe that will up your chances? Good luck. It is possible.