High-Frequency Price Volume Trend (PVT)

Query intraday minute-bar PVT (Price Volume Trend) for A-share securities via the market data service.PVT = cumulative sum of volume * (close - prev_close) / prev_close. Unlike OBV, PVT weights volume proportionally by price change. No configurable parameters.codes: comma-separated security codes (e.g. '600000.SH,000001.SZ').interval: minute bar width — 1/3/5/10/15/30/60.starttime/endtime: 'YYYY-MM-DD HH: MM: SS' intraday range.