I have the easiest way to collect $3 from anyone who has passing familiarity with crypto via Lightning.
It just needs the existing sign up systems to recognize this and build in a single call to my api and show a QR code.
I've long felt this would be easy but I just don't have the bandwidth to build a full sign up system.
My code worksm: you ask for 3 HBD and you get it 3s after a lightning invoice is paid.