Shake Shack is getting into crypto. The fast-casual burger chain is testing a promo where consumers who buy items using Cash App with the payment service’s debit Cash Card and its Cash Boost reward program can score a 15% refund in Bitcoin. Shake Shack’s CMO says the goal of the test is to gauge consumer interest in cryptocurrency, which could lead to future payment / promo options that involve crypto. More restaurants are jumping on the crypto wave: Cincinnati-based Wing & Rings announced it will accept franchising fees paid in Bitcoin, and Brooklyn Dumpling Shop installed a Bitcoin ATM at an NYC location. YPulse’s recent finance and spending monitor research shows 6% of Gen Z and 22% of Millennials invest in cryptocurrencies as an additional stream of income. (Nation’s Restaurant News)