To prevent duplicate payments, give each order a stable payment record, reuse the payment provider’s idempotency key when retrying the same operation, and confirm the provider’s final status before fulfillment. A timeout is not proof that a payment failed: the provider may have processed it even if your site never received the response. Check transaction records before asking a customer to pay again or promising a refund.
Build a stable link between the order and its payment
Your store needs to recognize when two requests refer to the same logical purchase. Keep a durable mapping between the order or checkout session and its payment attempt, and use it to prevent accidental creation of another payment when a shopper refreshes, double-clicks, returns to checkout, or opens multiple tabs.
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An order reference alone may not prevent duplicate processing at the provider. Adyen says it does not check merchant references for uniqueness; a shopper can open and pay multiple sessions, and Adyen treats those sessions as unique payment requests. See Adyen’s duplicate-transaction guidance.
Keep retries distinct from new purchases
For a retry of the same payment operation, keep the same internal attempt identity and use the provider’s documented idempotency mechanism. A genuinely new purchase or payment operation needs its own identity. Define this boundary in your application rather than inferring it from repeated clicks or browser requests.
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Stripe’s API guidance recommends one PaymentIntent per order or customer session. A PaymentIntent can move through multiple statuses and has at most one successful charge. This is Stripe-specific guidance, not a universal rule for every provider. See Stripe’s PaymentIntent documentation.
Make retries safe when a request times out
A timeout means your application did not receive a response in time; it does not establish whether the provider received or completed the request. If you retry as a new payment operation, the first request may still succeed and the second may create another payment.
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- Retain the identity of the original operation. Associate the request with the existing order and payment attempt.
- Retry with the same idempotency key. Follow the provider’s rules for the key’s scope and validity rather than creating a new key just because the first response is missing.
- Check the resulting provider status. Reconcile the response or subsequent notification with your order before allowing another payment or fulfilling it.
Adyen explains that its API idempotency feature lets a merchant retry a request while performing the action once. For a request that may have been processed despite a timeout, Adyen documents retrying with the same idempotency-key header and returning the first response if the request was already processed. Adyen’s documented key validity is 7 to 14 days after first submission; that period is specific to Adyen, not an industry standard. Its guidance also describes UUIDs, company-account uniqueness, and limitations involving regional endpoints. Check the current rules for your integration in Adyen’s API idempotency documentation.
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Payment processing may finish after the browser request ends. Do not treat the immediate checkout response as the only source of truth if the provider documents an asynchronous outcome. For an Adyen Checkout session, the outcome is delivered through an AUTHORISATION webhook. Adyen also recommends server-to-server webhooks to help track outcomes when a data-transmission timeout leaves the merchant without a response. See Adyen’s Sessions flow documentation.
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Model payment progress as explicit states—such as pending, authorized, failed, or requiring review—according to the provider’s API. Process notifications idempotently in your own system too: a repeated webhook should update the existing payment record, not create a second order or trigger fulfillment twice. Match each outcome to the correct order and payment attempt, and fulfill only after the status required by your business and provider is confirmed.
Investigate apparent duplicate charges before taking action
When a customer reports two entries on a bank statement, first determine whether the provider recorded two distinct transactions. Compare the provider’s transaction references and statuses against the order and payment-attempt records.
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- Two unique PSP references: Adyen says these indicate distinct payment records. Investigate whether separate checkout sessions or payment attempts were created.
- One PSP reference: The two statement entries may be a misleading bank display rather than two completed charges. Adyen notes that pending authorization and capture entries can sometimes appear this way.
- Pending or unclear status: Confirm the provider’s record before asking the customer to pay again or promising a refund. Banks differ in how and when they display or release pending entries, so do not promise a universal resolution time.
Adyen’s explanation and diagnostic guidance are available in its duplicate-transaction documentation.
Handle capture and refund failures as separate events
An authorization, capture, and refund are different stages or operations. A failed capture does not necessarily mean the initial authorization failed, and a refund request can fail independently. Adyen documents CAPTURE_FAILED and REFUND_FAILED webhook events; online capture and refund notifications can include structured refusal reasons. Record those outcomes and investigate the refusal detail before initiating another operation. See Adyen’s webhook notification documentation.
Review your provider’s behavior before implementation
Provider mechanics are not interchangeable. For the payment integration you actually use, verify the documented idempotency-key scope and expiry, how payment objects map to orders and repeated attempts, which asynchronous notifications establish the outcome, and which references and statuses help diagnose apparent duplicates. The Adyen and Stripe examples above illustrate those questions; they are not a complete provider comparison.
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