Visa and MasterCard are introducing Internet-based technologies to make it easier for shoppers to buy things at retail stores without pulling out a credit card. The two technologies, announced separately on Wednesday, will give merchants and banks more options for incorporating so-called contact-less payment systems into their mobile apps. The customer uses the app to make purchases by tapping the phone to a store’s card reader. The technologies tap a new feature in Google’s Android operating system. Before, card information had to be stored on a secured part of the phone. Now, it can be stored remotely instead. A retail or banking app on the phone then retrieves what’s needed to complete the transaction. Visa said it will provide app developers with a complete service, with card information stored on Visa’s servers. MasterCard said it will publish technical details by the end of June to help companies use the new Android feature, known as Host Card Emulation.