Resolve the correct cancellation backend and return the EIP-712 payload the client must sign before cancelling the same order.
The public order ID
Request typed-data payload needed to authorize an order cancellation.
Optional absolute Unix timestamp in UTC seconds when a tee-swapper cancellation signature should expire. Defaults to now + 5 minutes.
x >= 1Cancellation payload prepared
Typed-data payload the client must sign before cancelling an order.