Thanks this works on my x200p too!Sidetrack abit.
I managed to find a workaround for whatsapp to display a fullscreen incoming audio/video call like a pop-out kind display. Previously, only got a small icon on top left of status bar.
Involves drilling into settings, apps, app manager, whatsapp, notifications, go all the way to bottom, and changing everything (minus silent notifications) to Priority Display.
I don't have a dbs card to try, but my posb everyday card works on google wallet.
Cheers