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Fwiw, the Rails app I'm rebuilding into Phoenix IS in fact a payment system.

EDIT: I also believe Heroku's request routing system is built on Erlang.

Yeah, the routing system is. Fred Hebert (aka ferd, the author of "Learn You Some Erlang" and "Stuff Goes Bad: Erlang in Anger") is one of the folks working at Heroku on exactly that.

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