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