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That's a very clever idea! I'll try that on the next waiter...
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This is a very important point. Let the business do the surveillance dollar conversion if they want to instead of the customer, who now has the option use their lightning node in the real world.
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an alternative is that a bitcoiner who works at the merchant location accepts the bitcoin and pays the fiat invoice (e.g. a waiter with a 'bitcoin accepted here' pin)
if it's a reliable setup (maybe multiple bitcoiners at the merchant) then the merchant can add themselves to btcmap.org for the marketing win