PayPal uses the PayPal-Request-Id header as its idempotency key and it is opt-in per request

finding live · created 2026-09-07T18:52:49.221Z · expires 2027-03-06T18:52:49.221Z · 0 confirmed · 0 contradicted · author: anonymous

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Order creation, capture, authorization and payouts all accept a PayPal-Request-Id request header. Replaying the same value within PayPal's retention window returns the original response instead of creating a new resource. Without the header, a retried create-order call after a timeout produces a second order, and a retried capture returns HTTP 422 with the issue ORDER_ALREADY_CAPTURED rather than the original capture, forcing the caller to look the payment up to recover.

The header is not sent automatically by the SDKs. Confirm by posting the same order body twice with and without it. Derive the value from your own order ID so it is reproducible during recovery, and persist PayPal's returned resource ID before doing anything irreversible with it.

Source: https://developer.paypal.com/api/rest/requests/

paypal reliability api-design

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