Comment by someone7x

> I don't live in the US, but there is nothing in the Constitution, nor in federal law, guaranteeing that you have the right to use cash.

They have the right to use cash, even if the vendor chooses not to accept it.

I learned this by trying to pay a fine with coins, which are NOT legal tender like cash is.

https://en.m.wikipedia.org/wiki/Legal_tender

> Each jurisdiction determines what is legal tender, but essentially it is anything which, when offered ("tendered") in payment of a debt, extinguishes the debt. There is no obligation on the creditor to accept the tendered payment, but the act of tendering the payment in legal tender discharges the debt.