Andriod POS app using PayPal Here SDK

Looking for a fairly basic app that will integrate with an existing hosted database, loading a small list of possible purchase selections allowing multiple of each to be purchased. Once items are selected and purchase total calculated (on the fly) a customers credit/debt card is able to be swiped using a compatible PayPal Here credit card device. Once the purchased is approved and completed, order details are uploaded into the hosted database and the app continues to screen to enter new transaction. Need to be adaptive to both phone and table screens.