How to place pending order in XAUUSD by EA

 

Here is the problem, I am making a EA and I wanted to place some pending buy limit order in XAUUSD, and from this window:


I found that the price should be step up every 0.05.
I would like to ask that how can I get this information in EA?

I have tried to use SymbolInfoInteger(Symbol(), SYMBOL_SPREAD), and it return 320, seems not this method?

Reason: