If your gift card can be a "valid only in the United States" one it is going not be authorized at locations outside the usa.
I just earned 45 bucks in 5 weeks of casual use and turned that into a $5 Amazon gift card. My daughter absolutely loves gift cards because she wants to shop. https://groups.Google.com/g/giftcard-mall-my-gift-info/c/lJb4jNQqwjY