Changes to Create Order (V2)

added the non-success response with the status 403

added the non-success response with the status 503

the exchange_index request property default value 0 was removed

removed the optional property service from the response with the 400 status

removed the optional property service from the response with the 401 status

removed the optional property service from the response with the 409 status

removed the optional property service from the response with the 429 status

removed the optional property service from the response with the 500 status

the subaccount request property default value 0 was removed

the request property client_order_id became optional

endpoint added