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Why Error 429 and Error 500 Are a QA’s Best Friends: The Daily Reality of Testing Critical Flows

December 1, 2025 — Jaren

Split screen illustration of developer calmly saying "works on my machine" versus QA analyst surrounded by 429 and 500 error messages in flames during checkout testing

429 and 500 errors are a QA's constant companions, especially during checkout testing. Here's why these errors show up repeatedly in payment flows, how to professionally handle "works on my machine" pushback from devs, and why catching these errors before…

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