Map a security identifier to its FIGI (Financial Instrument Global Identifier) and metadata via OpenFIGI. Give an idType (ISIN, CUSIP, SEDOL, TICKER, FIGI, COMMON, WKN, CINS — or a raw OpenFIGI ID_* type) and idValue, optionally narrowed by exchCode (e.g. US, LN) or currency. Returns each matching listing with its FIGI, composite FIGI (per-country grouping), share-class FIGI (cross-country grouping), name, ticker, exchange code, security type, market sector, and description. Free, open symbology (Bloomberg OpenFIGI; FIGI is an open OMG/ANNA standard). The canonical "what is this security and what are its identifiers across exchanges" lookup — for trading, reference-data, and portfolio agents.