Sorry, this entry is only available in German.
The linked Tutorial gives a brief overview of all the steps that are necessary to integrate a RC522 RFID Reader via Raspberry PI into NodeRED environment using IBM Bluemix services, watson IOT and nodes.
Very interesting and quite easy to do:
A very helpful tutorial if you plan to use and install a RFID Cardreader and how to do it with a Raspberry PI Mini-Computer (sorry, only in german ):
RFID: Arduino talks RFID, very useful instruction (german only) !