I did this twice in the last week, in San Francisco, where tech is still big. “All parking meters in San Francisco accept payment by coin, pay-by-phone, and credit or debit cards (Visa, MasterCard, American Express and Discover).” SFMTA

Edit to add: It seems necessary that a governmental service (like parking meters) should be required to accept currency issued by the government. Refusing cash effectively removes a portion of society who can’t get or use other forms of payment. Not everyone has a bank account, credit card, or a smart phone, and they shouldn’t be required to use public services.