Had exactly that bug in production, was using ruby on rails & active merchant, and some version change in ActiveMerchant switched from cents to dollars for one of the integrations.
Our test harness didn't catch it (weird combination of reasons, too long ago for me to remember the details) & it rolled out.
Shortly thereafter I get an anxious customer call that we'd charged their debit card $2500.00 instead of $25.00 and they'd gotten an overdraft notice. At first I was incredulous ("how is that even possible!?"), then I remembered that we'd just version bumped ActiveMerchant.
My endocrine response as I realized what must have happened was amazing to experience - the sinking feeling in my gut, hairs standing up, sweaty palms, dread, pupils dilating, and my internal video camera pulling back poltergeist-style in a brief out-of-body experience.
Fun times. Live and learn.
Our test harness didn't catch it (weird combination of reasons, too long ago for me to remember the details) & it rolled out.
Shortly thereafter I get an anxious customer call that we'd charged their debit card $2500.00 instead of $25.00 and they'd gotten an overdraft notice. At first I was incredulous ("how is that even possible!?"), then I remembered that we'd just version bumped ActiveMerchant.
My endocrine response as I realized what must have happened was amazing to experience - the sinking feeling in my gut, hairs standing up, sweaty palms, dread, pupils dilating, and my internal video camera pulling back poltergeist-style in a brief out-of-body experience.
Fun times. Live and learn.