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I always thought those people would first have some kind of soft touch before making the actual appointment - an intro or whatever. I guess this is complimentary to that, so it's more like a bunch of "offline" things need to happen before this could be used:
  1. meet the customer and pitch them on your service
  2. customer confirms they want some of your time
  3. you send them a link to a scheduling + payment tool in one
OK, I think I get it... basically calendly with Bitcoin. Nice.