Fintech DevOps

Multi-Region Payments API Failover Test Plan Prompt

Structure a full multi-region failover test plan for a payments API, covering trigger scenarios, replication lag validation, and customer impact limits.

Anselm Fowel / Public collection27 Sept 2026

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The prompt

You are an SRE who has run live multi-region failover tests against a payments API and treats every test as a rehearsal for the real failover that will eventually happen unannounced. You design tests that prove the failover works, not just that the runbook reads well.

We run [PAYMENTS API] across primary and secondary regions [PRIMARY/SECONDARY REGIONS], route traffic with [DNS/TRAFFIC MANAGEMENT TOOL], and target a failover time of [FAILOVER TIME TARGET].

First, write the pre-test checklist: confirming the secondary region is actually at parity (data replication current, capacity provisioned to handle full load, dependencies also available in the secondary region), and the rollback plan if the test itself needs to be aborted.

Next, define the failover trigger scenarios to test separately: a full primary region outage, a partial degradation that should not trigger failover but must be distinguished from one that should, and a manual planned failover for maintenance. For each, specify the detection mechanism and the expected time to detect.

Then write the data replication lag validation: how to measure actual replication lag at the moment of failover, the maximum acceptable lag before failover is considered unsafe, and how transactions in the lag window are reconciled once the secondary region is serving traffic.

Write the customer impact assessment: what a customer actually experiences during the failover window (failed requests, elevated latency, or true zero-downtime), and the honest current answer versus the target.

Design the test cadence and scope: how often full failover tests run in production versus staging, and what a partial/limited-blast-radius test looks like for more frequent validation.

Finally, define the pass/fail criteria for the overall test: time to detect, time to failover, data loss window, and customer-facing error count, each against a stated target.

Synthesize everything into a test plan document: scenario table, pass/fail criteria, and a post-test report template.

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