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In what cases can a business refuse to take cash?
A business can refuse cash (paper currency) payment pretty much in all cases provided it's a reasonable policy and/or notified during/in advance of contracting. Details in this link. "all United States money as identified above are a valid and legal offer of payment for debts when tendered to a creditor. There is, however, no Federal statute mandating that a private business, a person or an organization must accept currency or coins as for payment for goods and/or services." Even if the payment is being made to settle a debt or other obligation, the creditor may refuse payment if their rationale is reasonable (as determined by the courts).