I had a couple of cast members at quick service locations tell me that I couldn't pay with cash, only mobile order. While I suspect that wasn't entirely true, I chose not to press the issue and went elsewhere. That said, the quick service locations that did allow me to use cash did so with obvious reluctance. Honestly, I felt safer going inside to order food than standing elbow to elbow with the crowds huddled around the entrance, waiting for their mobile orders to pop up on their phones. I had no problems using cash to pay for merchandise.