Ask HN: What do you use for recurring billing? 9 years ago
Open Source http://killbill.io/subscription-billing/
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barile
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swagger.io for the apis + README.md on each service's repo
Doesnt look like a problem worth pursuing in 2015. Take a look at http://www.ledger-cli.org/ and their libraries on github (there are haskell ports and a web frontend)