def METHOD_NAME(
    cls,
    outbound_transfer,
    api_key=None,
    stripe_version=None,
    stripe_account=None,
    **params
):
    return cls._static_request(
        "post",
        "/v1/test_helpers/treasury/outbound_transfers/{outbound_transfer}/fail".format(
            outbound_transfer=util.sanitize_id(outbound_transfer)
        ),
        api_key=api_key,
        stripe_version=stripe_version,
        stripe_account=stripe_account,
        params=params,
    )