Hi @manojpj,
The default country selection for the smart card fields is determined by PayPal and depends on a few factors.
For example, the language code in eventual PayPal cookies on your device, your browser/system language, or your current location.
As an alternative, with the PayPal Card Processing (if available in your region), buyers only need to provide the credit card number, expiry, and card code to confirm the payment. There is no need for any additional billing information or even PayPal account login.
This would be the best way to prevent users from having to provide additional information in the first place.
Kind regards,
Niklas