Suppose I live in a state with a low sales tax and travel to one with a higher rate. I pay with a credit card, just as I would if I were at home making a payment to an online reseller. Do I get charged my home-state tax rate? NO.
It depends on the states. If you are a resident of Alaska, Colorado, Delaware, Montana, New Hampshire, Oregon, American Samoa, Alberta, the Northwest Territories, Nunavut, or the Yukon Territory and you are visiting Washington, you are not charged sales tax on tangible personal property, digital goods, and digital codes purchased in Washington if they are for use outside Washington. You show the merchant picture ID that shows your address, and they ring up the sale without sales tax.