Apple (AAPL) has had an incredible run. Shares are up 66% in the past year, thanks largely to the booming success of the iPhone 6. Now that the iPhone 6 has been deemed a huge success, investor attention is turning to what might be Apple’s next major opportunity. Fortunately, Apple still has plenty of catalysts left for future growth. One of them is Apple Pay, a new service that allows Apple device users to pay for items in stores without ever having to open their wallets. This is a more convenient, more secure way to pay for things. Not surprisingly, analysts are increasingly optimistic that the Apple Pay system can eventually add to Apple’s growth. Although this will take time, since Apple is such a huge company that a new product or service needs to be very significant to move the needle, future earnings estimates will likely increase.