<prompt> Human: Ive got a quick question for you all. A friend recently asked me to return an item to a store: he visited me from out of town, bought the item, it didnt fit, but he couldnt return it before leaving. The stores policy is that they put credit back on your credit card when you return an item. So he called ahead to the store and worked out with them that when I bring the item in, they could talk to him on the phone to get his credit card number and issue the credit back.So far so good -- but when we did this, the store asked me to sign for the transaction on the keypad touch-screen. At the time I figured that since my friend is explicitly having me do this, and the store knows whats up and is OK with it, that it would be fine. But now Im sort of worried that, if the credit card company audits signatures or whatever, seeing my signature is a red flag.Mitigating circumstances are, of course, that all involved parties gave permission, and that this is crediting back to the credit card, not making a purchase with it. Sort of like how its possible to make a deposit to someone elses bank account at a bank without being them -- why would a criminal do that, etc.Is this generally OK to sign for someone with permission? Or should I be worried? Are there laws against this? Will some system flag it and get me in trouble? What should I do in the future if Im in the same circumstance? Maybe sign my initials for friends name in the box?  <response>: But now Im sort of worried that, if the credit card company audits signatures or whatever, seeing my signature is a red flag.Its not going to matter. Youve done your due diligence. 