Official list of countries for In-app Billing android?

Hello I am currently in Pakistan and when I start Google sample in-app billing application it says that

"Can't Make Purchase: The market billing service is not available at this time. You can continue to use this app but you won't be able to make purchases."

Please if any body know that complete list of supported countries or knows what is going wrong please tell me.

http://developer.android.com/guide/market/billing/billing_integrate.html#billing-implement

UPDATE

Application has been uploaded on market but not published, uploaded as a draft
Product list has been created and published
Application on device signed with same key, than application on market.
Email registered in Market app is in test emails list.
Android Market application version than 2.3.6
Android OS version is 2.3.4 Nexus One

Solution

you go here you country is not there http://www.google.com/support/androidmarket/developer/bin/answer.py?answer=150324 think thats the problem