Ah, the classic "forgot to replace the template variables" bug. Someone at Amazon just pushed to production without testing their notification system. Now millions of users get to see the raw template code instead of their actual cashback amount.
This is why we do code reviews, folks. And why senior devs drink so much coffee. Somewhere right now, a developer is frantically trying to hotfix this while their manager asks, "But how could this happen?" Meanwhile, the QA team is just pointing at their ignored test reports from last week.