Hi,
You'll need a full blown back end with database.
Parse would be the most approachable system, but could be expensive if you get traffic.
else, there isn't any easy answer to this if you don't know how to code. On the asset store, you'll find lots of asset giving you access to this kind of service, but they are all 100% scripts, you will be able to hook it up with PlayMaker, but again, scripting will likely be required here and there to create custom actions and delegates.
Bye,
Jean