Mane wroteHello!
In the USA you can get tax refunds from 2 states only, Louisiana and Texas. The tax refunds would be additional cash made by travelers, since the state where they made a purchase would have the traveler's payment details.
But this means that buyers can offer very little reward if they're buying something eligible for a tax refund, knowing that the tax refund itself would be a payment for the travelers.
Good to know, but if the traveler is using detaxe when leaving an European country he can get 13% refund which is way too much as bonus, imagine a 500 euros item, he will get 65 euros bonus, it's the cost of DHL even more ;)
So better to implement an option in your website for the tax refund thingy, when a traveler say he will bring from Europe AND he lives outside Europe then you must give him a sort of warning that he can benefit from a tax refund, he should then agree with the buyer how they will act, will he get all the refund as the bonus or will he get a part of it?