Can You Use a Discount Code with Goodyear Tire Purchase Online

I'm curious about using discount codes on online purchases of tires directly from Goodyear's website. I've seen some promo codes floating around for tire deals and discounts but wasn't sure if they could be applied to a purchase made straight through their site. Has anyone else tried this? Do the same codes work online as they would in-store or at an authorized retailer? Does it make a difference which website you're on (e.g. Goodyear, Amazon, etc.)? Any experiences or insights are appreciated!