Get binary-options realized PnL for an authenticated account, grouped by event and ordered newest event first. cursor is an exclusive event id; event_id returns a single event. Every outcome the account has traded is reported, including markets still open or unsettled, so an entry never disappears as the account trades. Per outcome, total_pnl is all realized PnL so far including settlement, and settlement_pnl is null until the market settles with a position to settle, then the string 0.000000 for an actual zero-PnL settlement. An event's total_pnl is the sum of its listed outcomes. Missing display metadata uses zero/empty values.