Only certain countries are cleared for purchases using Google's Merchant system, which runs In App Billing.
If you are not able to have a Google Merchant account you must make the following change to your Manifest.
Locate this line:
<meta-data android:name="com.skillz.IAB_PUBLIC_KEY" android:value="null" />
Remove the entire line from the Manifest. This will remove the In App Billing functions in Skillz.
To find a list of supported countries for In App Billing see This Article.
