A question on Personal Finance & Money asks for options to pay a parking "fine" when the recipient is not trusted. The asker is not arguing that they owe the money but, for security reasons, they do not want to use any of the methods offered by the parking company to make the payment. The comment below on one of the answers raised a good question.
This is a fine i.e. there is an obligation to pay: surely this implies that the Legal Tender rules are relevant and they are obliged to accept cash?
My understanding is, that legal tender must be accepted when a debt exists. Even though, in strict terms, the charge is being made by a private company and, again to my understanding, is not a fine, does this create a debt that cannot legally be refused to be settled with cash?