Just to note though that each credit is separate though. So if price goes down twice $50 each time it will show a $100 balance but when you apply it to a new flight it is two $50 credits
This is important in that southwest only allows 4 types of payments per transaction. So you could apply 3 credits and pay balance with cc
I ran into this issue when trying to book flights for my family of 4. We each had credits but not enough to cover the entire cost. Had to split up buying the tickets. And couldn't use one of my credits.