My apologies. I misread your question. For some reason I thought you were asking what Eikon APIs you could use to retrieve static data.
Since you're actually interested in consuming data in an enterprise application the product you should look at is Datascope Select. RFA API can only deliver market data from Thomson Reuters real-time data network known as Elektron. For static data you need Datascope Select. Please follow the link below for the Datascope Select page on this portal.
If the only static data you need is symbology conversion for equities, then you can use Symbology service of Eikon .NET API. See
But if you also need fundamental and reference data for stocks then you should use DEX2 COM library instead
RFA API and other TREP APIs can not used to request static data for equities such as SEDOL, ISIN. Baiscally it support only Real-Time market data from Elektron for RealTime. And user has to know RIC name in advance when request the data.
As Alex said the product you should look at is Datascope Select.