The country associated with your Google payments profile and Developer Console accounts can't be changed after the two have been linked. If the the email address also is linked to a Google Payments Buyer account, the same condition applies.
As an alternative, you can create new accounts and transfer your apps. Keep your pre-existing account open until all balances have been paid out Google payments center balances can't be transferred between accounts.
At this time, payments center supports app and in-app purchases only. As of 2013, Google no longer supports the purchases of physical goods, services, digital goods, or donations through Google Checkout. As of 2013, Google purchase buttons have been retired, and this service is no longer supported on merchant websites.