why must credit card be same country than billing address ??

I'm experienceing the same difficulties. I am a foreigner living in South Korea. With a Korean credit card and billing address.

My problem gets more comlicated because the App store for Korea is not in English!

I hope Apple reconsiders this. Becuase noe everyone in South Korea using the Korean Appstore speaks Korean...

The Apple Support Communities are an international user to user technical support forum. As a man from Mexico, Spanish is my native tongue. I do not speak English very well, however, I do write in English with the aid of the Mac OS X spelling and grammar checks. I also live in a culture perhaps very very different from your own. When offering advice in the ASC, my comments are not meant to be anything more than helpful and certainly not to be taken as insults.

Apple's rules are that you must use the Mac App Store/iTunes Stores for the country of your residense. If you use a bank card it must be a verifiable card from a bank in your couuntry of residense with a verifiable billing address in your country of residence. Period. There is no way to get around it if you intend to make purchases with a bank card.

I suggest that you open a simple bank account in Thailand that will provide you with a bank VISA/Master Card debit card and then fund the account with enough money to cover your purchases.

Can't you redeem gift cards?

If you notice, I did not say credit card, I said debit card. There would normally be no costs involved with a debit card used for Point of Sale purchases.