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Money is the most universal and most efficient system of mutual trust ever devised.
— Yuval Noah Harari[1]
Any company needs at one point to get money from customers. That's when things gets messy for us developers, as we try to reconcile the complexity of the business with our software stack.
This 
list helps software engineers bootstrap billing & payments systems, and make sense of invoicing, pricing, accounting, marketplace, fraud and business intelligence.