Is it legal for a business to refuse payment in cash?

A lot of businesses these days are credit card only, the most prominent example being certain airlines, or just companies that don’t trust their employees to handle cash. Medical Marijuana dispensaries in California also come to mind. On the face of every US dollar bill, it says “this note is legal tender for all debts, public and private” [emphasis mine]. Doesn’t that seem to imply that you can pay for anything in cash? Is there some relevant court decision on this?