Why can't I use my google play card for purchase

[Guest]

I have tried to use my Google play balance to purchase a smule Karaoke app but it's saying I can't use this for the purchase. Does anyone know how I can do this? I put my last $10 on a play card, but now it won't work. Very frustrating. Please any help will be great thanks.
Any tricks or possible way to make it work?

 

[B. Diddy]

Welcome to Android Central! Go to this page and click Contact Us at the upper right to request a call or chat: https://support.google.com/googleplay/?hl=en#topic=3364260