Android Billing Permission

Hi,

I'm exporting a C3 project, I used the IAP plugin to sell products into my App, but after uploading it to Google Play Store it says that I'm missing the permissions for BILLING.

Is there a way I can add this in manually (if not through some options).

I think its something to do with: <uses-permission android:name="com.android.vending.BILLING" />

...but I don't know where to add this.

Thanks