My credit card company paid $800 towards the airfare of my recent trip to Oz thanks to reward points. I pay my card off multiple times per month. They don't ge

My credit card company paid $800 towards the airfare of my recent trip to Oz thanks to reward points. I pay my card off multiple times per month. They don't get a chance to charge me interest. (Just checked and I have $300 worth of points waiting to be spent on travel. That's my upcoming Boston trip covered.)