There is no 'international' gift card. A gift card must be redeemed in the same country to which the purchasing Apple ID account belongs.
In If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support Apple advises, "You can't redeem Apple Gift Cards or App Store & iTunes Gift Cards outside of the country or region of purchase. For example, if you bought an App Store & iTunes Gift Card in France, you can't redeem it in the App Store in the United States."
Your additional problem is that from your description Aruba does not seem to be recognised as a territory for the purposes of setting up an Apple ID Account or a valid payment method.