Square Point of Sale does not currently support multitasking. This means that payment processing may be interrupted by an incoming call or text message. This also means that you may be unable to successfully accept credit card payments if you are using your mobile device to play music simultaneously.
We recognize that multitasking is a popular function of mobile devices, and we are working to incorporate this feature into our app. In the meantime, it’s easy to ensure that your payment successfully completes.