Resolved — Monitoring. We identified intermittent 502 responses from Payment-Gateway-X as the root cause of Loyalty checkout failures. Traffic was routed to a fallback gateway and a configuration rollback was applied; error rate dropped from ~10% → ~0.8% and checkout success has returned to near-normal levels. We’re continuing to monitor metrics for 30 minutes to validate stability — if metrics remain stable we will mark this incident fully resolved.