I have looked at
https://developers.refinitiv.com/eikon-apis/net-apis-use-custom-applications/downloads
but not sure how to request data for reference fields.
For example,
MSFT.OQ
TR.AvgDailyVolume30D
TR.GicsSector
TR.CompanyMarketCap(CURN=USD) (what if I want to pass multiple arguments? SDate='2019-3-31')