windows phone 8.1 - Can we add google admob in WP8.1 WinRT App -

i trying add google ad mob in wp8.1 winrt app facing issues can me such why unable use google admob in wp8.1 wnrt app. , how implement it.

for convenience (and money) microsoft wants use pubcenter. can see more data on how use advertising sdk made them use of pubcenter here