I\'m trying to use In-App billing:
mIabHelper = new IabHelper(this, BILLING_KEY);
mIabHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
The documentation for version 2.0 of the billing was actually more helpful than 3.0 for this one even though I'm using version 3.0 of the billing.
Here's how 2.0 describes it Response Code 3:
Indicates that In-app Billing is not available because the API_VERSION that you specified is not recognized by the Google Play application or the user is ineligible for in-app billing (for example, the user resides in a country that prohibits in-app purchases).
For me I had to setup a test Google account on my phone first before testing. I forgot that step. Once I did that fixed it for me...
Look for Server Response Codes here:
http://developer.android.com/google/play/billing/v2/billing_reference.html
http://developer.android.com/google/play/billing/billing_reference.html