MQL4 Reference Constants, Enumerations and Structures Trade Constants Order Properties
Operation type for the OrderSend() function. It can be any of the following values:
ID
Value
Description
OP_BUY
0
Buy operation
OP_SELL
1
Sell operation
OP_BUYLIMIT
2
Buy limit pending order
OP_SELLLIMIT
3
Sell limit pending order
OP_BUYSTOP
4
Buy stop pending order
OP_SELLSTOP
5
Sell stop pending order