The only restrictions with Maritz I've dealt with are; I must pay without the gas branded credit card. Forgot, need to wear a safety vest & no customers in the photos.
Are you trying to use the branded shop rewards program? I've never seen where that slaps my face & is a big no-no in the guidelines. But considering the guidelines are very specific about using the gas-branded card, it seems logical that the rewards and/or shop may be denied.
I've never been required to use points for a shop and I wouldn't part with mine for a MS shop. You're right, reward points are money. In my family, they are big money!
Live your life in such a way that when your feet hit the floor in the morning; the devil shudders...And yells OH #%*+! SHE'S AWAKE!