All you have to do is create a business solution - MobilePay MyShop (Google play), (App store). With that solution, you get a unique MyShop number that your customers can send money to. And you don't have to deal with extra equipment. Whether you sell in a store, provide a service, sell online, or in an app. See your options here (only in danish).
MobilePay can also answer a number of your questions here (only in danish).