Spring Security Module for PayPal as an Identity Provider
I've created a Spring Security extension that allows for using PayPal as a remote identity authentication source. I modeled it off of the CAS extension. I'd be happy to contribute the code to the project if there is any interest. Please let me know.
For those who don't know, PayPal offers an Identity Provider service. It is not standards based and therefor one must customize Spring Security in order to use the IP service. That said, PayPal has recently launched a standards based (OAuth) service called PayPal Access. I'd be happy to write an extension module for this as well if needed, or just a sample app if the existing OAuth extension suffices.