Permissions required: Reject Operations

Reject an in-progress transaction. The caller's API key must hold the
Reject Operations permission for the source vault. Operations already
in a final state return 409 Conflict.

Only withdrawals, transfers, delegations, generic operations
(including bridge transactions), and off-chain signing requests can be
rejected via this endpoint. An off-chain signing request is a
personal_sign or eth_signTypedData_v4 request, which
GET /v2/transactions/{transactionId} returns with a rawTransaction
of type ETH_PERSONAL_SIGN or EIP712_ETH_SIGNTYPEDDATA_V4. Rejecting
any other operation type, including any other off-chain operation,
returns 409 Conflict.

A transaction can only be rejected before it has been submitted for
signing and broadcast to the network. This endpoint cannot be used to
cancel a transaction stuck in the broadcasting state due to a low gas
fee.