Read a fill

A real fill ties your ClOrdID (11) to venue ids and quantities.

35=8|11=ORD-42|17=EXEC-9001|37=VENUE-77|150=F|39=2|55=EUR/USD|54=1|
38=1000000|14=1000000|6=1.08542|…|

Tag	Role on a fill
11	ClOrdID — your key
17	ExecID — unique execution
37	OrderID — venue book id
14	CumQty — filled so far
32	LastQty — this fill slice
6	AvgPx / last price context

Rule: never book P&L on 150=0 alone — wait for F with meaningful 32/14.