create a signing requestAsk AIpost https://example.com/signaturescreate a signature request to sign the payload hashBody ParamsfinIdstringrequiredthe fin IdtemplatehashListEIP712requiredhashListTemplate objectreferenceexecutionPlanRefExecutionPlanReference objectHeadersIdempotency-Keystringhex encoding of a 32-byte payload consisting of 24 random bytes + 8-byte epoch timestamp (seconds)Responses 200successful operation 202Operation is pending 400Invalid Input 401Unauthorized 403Forbidden 404Not found 409Conflict 500Internal Server Error 502Bad Gateway 503Service Unavailable 504Gateway TimeoutUpdated 8 months ago