checkout issue

Im trying to purchase a theme using my debit card on check out page. Though the debit card is activated in successfully for the international transactions, cant able to complete my transaction. It says like, Payment is unsuccessful. Furthermore, i already contacted my bank branch if the debit card is being restricted for this kind of transactions, they told me like everything is fine with my card for the transaction. however, im having trouble to make a payment to purchase a theme on checkout page using VISA DEBIT CARD.

please kindly help me out to check out my transaction in successfully…

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