Depends... You can edit your payment methods and exclude countries (and from the looks of it you only ship to Mexico and Canada beisdes your own), so they wouldn't be able to 'pay' > impossible to checkout. Or you can leave the payment method and edit/setup your shippingoptions in a way international buyers can only checkout with more secure shippingoptions (more secure for you that is).
Comments
Its not the payment - it is the lost packages