I mixed up the meanings of "debit" and "credit", and wrote a credit card process...

		kirkthejerk on Jan 29, 2014 \| parent \| context \| favorite \| on: Ask HN: What's the worst you've ever screwed up at... I mixed up the meanings of "debit" and "credit", and wrote a credit card processing app that ended up PAYING $75K to our customers instead of charging them. I'm still not sure how this bug slipped past the bank's tough app certification process, though.