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The State of MN stopped accepting certain credit cards for many DMV type activities, and now only accept ones that allow an explicit surcharge (Visa, Mastercard, Discover, Amex).

> Limit surcharging to credit cards only (debit cards and prepaid cards cannot be surcharged)

This is just one of conditions, being "allowed" is very limited.

With the important caveat that the surcharge can't be more than 3% or the fee, whichever is lowest. Is there a similar caveat for cash discounts?