[UHQ][LEAK] How to get $300 Instacart Refund

Hey! Wanted to give away the infamous $300 Instant Instacart method. Friend of mine figured out how to do it and told me to give it away.
EDIT1: Apparently they've caught on so I've heard $200 is the limit now
edit2: method might be dead now so don't use unless it's your first time - 3/17/NEW