Mimic Safari browser on WKWebview

I would like to Mimic safari on my current existing browser app. Everytime I open Yeezysupply, add something to cart, I can see checkout page (see pic).But when I open my browser, load the same page, I would like to Mimic safari on my current existing browser app. Everytime I open Yeezysupply, add something to cart, I can see checkout page (see pic).But when I open my browser, load the same page, it wont load the checkout page. (See pic 2 - loading circle). This may be because the site is identifying that I am using an app,...