Thanks to an upcoming update of its operating system, the iPhone could soon be used as a payment terminal for small transactions. For a long time now, the iPhone has been used for much more than making phone calls, playing games and surfing the web and social networks. Now it can also be used as a key for unlocking your hotel room door or to start up your car. Soon, it could add a new string to its bow, functioning as a payment terminal. According to Bloomberg, Apple intends to add this new feature in a future update of iOS (15.4). This would be a logical next step after the acquisition, two y…