[FIG(quote)[
[FIGCAPTION[
[1] [CITE@en[Stripe API Reference]]
([TIME[2015-08-29 17:39:09 +09:00]] 版)
<https://stripe.com/docs/api#idempotent_requests>
]FIGCAPTION]

> To safely retry an API request without accidentally performing the same operation twice, you can attach a unique key to any POST request made to the Stripe API via the Idempotency-Key: <key> header.

]FIG]


[FIG(quote)[
[FIGCAPTION[
[2] [CITE@en[Stripe API Reference]]
([TIME[2016-12-16 17:59:49 +09:00]])
<https://stripe.com/docs/api#idempotent_requests>
]FIGCAPTION]

> To perform an idempotent request, attach a unique key to any POST request made to the API via the Idempotency-Key: <key> header.

]FIG]


[3] [CITE@en[Stripe API Reference - Idempotent Requests]], [TIME[2021-01-21T04:44:29.000Z]] <https://stripe.com/docs/api/idempotent_requests?lang=curl>