Abstract: The present disclosure is directed to deployment of applications to mobile devices such as, for example, payment terminals. In some embodiments, a method includes uploading a mobile application that is for execution on a group of mobile devices; preparing the mobile application for deployment; receiving a first request with a deploy plan that specifies parameters and a subset of mobile devices for deploying the mobile application; and deploying the mobile application to the subset of mobile devices according to the deploy plan.

Abstract: The present disclosure is directed to handling secure deployment of applications to devices. In some embodiments, the secure deployment includes uploading a mobile application that is configured to perform a process for handling transactions on mobile devices; automatically scanning the mobile application to determine whether the mobile application is secure and compliant; cryptographically signing, via a signing service, the mobile application in response to determining the mobile application is secure and compliant; and enabling deployment of the mobile application to the mobile devices based on the cryptographically signing the mobile application.

Abstract: The present disclosure is directed to handling communication, including handoffs, between applications on a payment terminal. In some embodiments, a method comprises: receiving, by the first mobile application, a first request from a user to conduct a transaction via the first mobile application and transitioning control from the first mobile application to a second mobile application running on the mobile device to collect a payment for the transaction being processed by the first mobile application in response to receiving the first request to conduct a transaction. Subsequently, after processing the payment for the transaction, the method includes transitioning control back to the first mobile application from the second mobile application as part of sending an indication of results of processing the payment by the second mobile application.