Working template: Checkout webhooks: prevent duplicate orders and fulfillment

Editorial working template
https://www.ecommerce.spot/en/guides/checkout-webhooks-duplicate-orders
Reviewed: 2026-10-24

Record your own quantities, decisions and acceptance evidence. This editorial planning template does not replace a provider proposal for your specific requirements.

Project / owners / date:
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Prevent duplicate checkout orders by linking verified payment state to a stable internal purchase reference and durable processing progress. Verify webhook authenticity, deduplicate events and protect purchase-level effects against concurrent handling. A repeated event or browser return must not create another order or warehouse job.

1. Purchase identity
Record internal order, checkout session, payment and fulfillment references and their relationship.
Your inputs / decision:
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Evidence / owner / unresolved issue:
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2. Verification rules
List accepted event types, authenticity checks, payment states and the route for unmatched objects.
Your inputs / decision:
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Evidence / owner / unresolved issue:
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3. Duplicate protection
Document event identity, purchase-level protection and expected behavior under concurrent handling.
Your inputs / decision:
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Evidence / owner / unresolved issue:
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4. Recovery plan
Record intermediate states, downstream references, reconciliation and authorized retry actions.
Your inputs / decision:
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Evidence / owner / unresolved issue:
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5. Acceptance evidence
Capture duplicate, concurrent, invalid-signature, delayed-payment and timeout outcomes.
Your inputs / decision:
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Evidence / owner / unresolved issue:
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Acceptance checklist
[ ] Order and provider identifiers have a stable documented relationship.
[ ] Signatures and provider delivery checks are verified.
[ ] Only relevant authorized payment states start fulfillment.
[ ] Event deduplication and purchase-level duplicate protection are distinct.
[ ] Concurrent processing cannot repeat the business effect.
[ ] Intermediate progress survives a restart.
[ ] Downstream timeouts have a reconciliation path.
[ ] Operators can retry without creating a new purchase.

Article references
Stripe: Webhook delivery: https://docs.stripe.com/webhooks
Stripe: Checkout fulfillment: https://docs.stripe.com/checkout/fulfillment