What it's like inside Amazon's futuristic, automated store

I open the Amazon Go app on my phone, scan a QR code on top of the white turnstile and watch as electronic arms open to let me in. Glancing around the convenience store, which is bustling with Amazon employees shopping for lunch items, I head left to the cold drinks section, grab a can of Diet Pepsi and exit through the barrier. Not once did I pull out my wallet or tap my phone anywhere to make a payment. I'm getting a preview of the Amazon Go automated store within the internet giant's headquarters in Seattle.