Changes to Read watch events after a cursor, oldest first

deleted the header request parameter X-Agent-Key

the endpoint scheme security AgentKeyAuth was added to the API

added the optional property message to the response with the 401 status

added the optional property message to the response with the 503 status

added the required property code to the response with the 401 status

added the required property code to the response with the 503 status

added the required property error to the response with the 401 status

added the required property error to the response with the 503 status

endpoint added