Is it possible to read the credit card details (name, number, expiry) of a Visa payWave card via NFC on a Samsung Galaxy Nexus? What about other NFC-enabled credit cards?
Triangle.io also has an API that allows you to do this free of charge and you can integrate it in your own application. You can download the sample application from Google Play.
Disclaimer: I work for triangle.io
There are at least 2 Android apps that can already do this: Squareless and Electronic Pickpocket RFID.
Some references: