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MQL4 Reference  Trading functions  OrderCommission

 
double OrderCommission( )
Returns calculated commission for the currently selected order.
Note: The order must be previously selected by the OrderSelect() function.
Sample:
  if(OrderSelect(10,SELECT_BY_POS)==true)
    Print("Commission for the order 10 ",OrderCommission());
  else
    Print("OrderSelect failed error code is",GetLastError());