datastream-api dsws-api python datastream data r api eikon-data-api eikon derivatives error time-series data-type forex connection token mnemonics historical .net date vba equities api-limits datastream-for-office index rics eikon-com-api c# r-studio excel authentication symbology esg log-in trade economic-data pricing eviews request constituents fields isin screener matlab vbscript indices volatility credentials rest-api static-data connection-error json issue java corporate-actions proxy financial-statements documentation fundamental-data thomson-reuters screening permid-api tick-history-rest-api funds filter credit-ratings forwards stata javascript ubuntu volume settlement key-error exchanges sectors setup error-403 snapshot-pricing eikon-for-office company news formula-builder fundamentals dss-rest-api bonds delivery batch lipper refinitiv-realtime soap-api sql backtesting error-handling Download pe-code side-by-side-api point-in-time e-views