Paypal module issue in titanium android

I'm trying to use the Paypal module on Android (Android 4.1.2, Titanium 3.5.1 GA , Paypal 2.2.3). Using the sample code, the button does get displayed, but clicking on it does nothing happens; no error, no response - nothing.

Any ideas what needs to be done to get Paypal working? Has anyone successfully got it working on Android?

but works perfects on ios.