Creates a new websocket ticket. Should be sent in the body property called ticket to subscribe to the websocket private topics.
The API key as a string.
See the Generating Signature section for more details.
A timestamp in milliseconds. See the Timestamp Security section for more details.
An additional, non-required parameter, that you can send to specify the number of milliseconds after the timestamp for the request to be valid. See the Timestamp Security section for more details.