rkd-api rkd data api query-string rics fundamentals news historical quote json c# python token fields search time-series java websockets symbology soap-api http php perl commodities ssl document financial-statements trep proxy throttling bonds .net street-events error rest-api xml fiddler authentication trade pe-code load-balancing Service error-403 sectors kotlin timeseries derivatives FTP etf feeds web exchange-holidays api-limits disconnection economic-data time-stamp upgrading performance forex r wsdl response key request timestamp pricing error-400 helpdesk isin swagger javadoc connection-error postman documentation streaming-prices volatility bulk-download transcript Download equities pandas error-message fundamental-data news-filter