coupon --> smartphone -->checkout
Bill Ready asks, "What if you could whisper in a consumer’s ear that the item they’ve been looking for is now available, and put a coupon for it right in their pocket? A push notification to a smartphone does exactly that. And it can go even further with a one-click payment link that completes the purchase right then and there, without the need to visit a store – or open a laptop."
Read his complete Forbes.com piece about mobile devices shaking up e-commerce.