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Mark a sandbox charge as failed through the canonical flow

POST 

/v1/_test/charges/:id/simulate-failed

This authenticated, merchant-scoped helper is exclusive to sandbox. It produces the same durable effects as the canonical failure transition and preserves the original response across retries.

Request​

Responses​

Canonical transition completed or original response returned.

Did this page unblock the next step?

Feedback stays inside the docs flow and should never include customer or card data.