Android supports Intents as the messages between components such as activities, services and broadcast receivers. An application can broadcast any messages through Intents to more than one application by using Context.sendBroadcast() API such as below;

            
Intent intent = new Intent();
intent.setAction("com.bankapp.ShowCCInfo");
intent.putExtra("CreditCard", creditcard);
sendBroadcast(intent);
                
            

Any other application that registers for receiving broadcasts, either in manifest file or in code, can intercept the sent credit card information.