Incident · Sev 1Advanced

Payments double-charged

At 14:02 the payment gateway slowed down. By 14:30 support has 212 tickets: customers charged twice, and paid orders that never shipped. Work from the checkout inward. Each stage's logs hold the clue, and some lines are noise.

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Select the pulsing payment client to investigate.

Logs

Open the failing component to read its logs.

Start investigating

Open the payment client, read its logs, and choose the fix.

What this incident covers

Payment client (calls the gateway): Failures, Retries & Rate Limits
Payments service (charges cards): Idempotency & Exactly-Once Illusion
Order writer (saves and announces): Event Sourcing & CQRS
Fulfillment (ships orders): Queues & Pub/Sub