Gm financial 0% apr

I’m in the market for a new Silverado since I unfortunately totaled mine on Sunday.
I saw the ad for the 0%. I have good credit (800+) and good income with only my mortgage as debt and whatever balance is on my credit card I pay off monthly. Is there anything I need to do to get this rate? Or is there still negotiation on the truck price if I can get it? I had read of they give the 0% they take away all the discounts usually in the flyer.