The 14 pains of building your own billing system - Arnon Shimoni.
Trying to cobble together your own billing system is like wrestling an octopus that’s armed with tax codes and invoices instead of tentacles. It’s a beast of complexity that can tangle up everything from customer support to compliance. I have 14 points on why it’s hard.
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We ran into timezone mismatches causing issues with proration and subscription renewals. Ended up logging everything with timestamps in UTC, then converting on display — saved us a ton of headaches.