“This note is legal tender for all debts public and private.”
“I wonder if you could require them to take cash...”
I’ve wondered that myself, do you know? Is that what that means, “you must accept this item in payment”, or does it mean “this item is completely acceptable as payment”?
I believe that it means it must be accepted to settle all debts. But if the seller refuses to sell to cash customers, it may be that do debt has occurred. Now, if he gives you the coffee and asks for payment, the debt is there then I think he legally has to accept cash.