@teriraia wrote:
I have done this shop many times and never been asked to put the ss number on the back of the check, just sign it. Ace is a reputable company so maybe it was just an error on the employee's part. When I did my first shop I did have to provide my social security number to be put into the system but that was on the initial paperwork, once you are in the system you do not have to provide your ss number again.