Newbie question 2

I just sold my first book a few days ago. Does amazon automatically confirm your shipping when you buy the shipping fee? I saw the confirm shipping button on the order page but I never pressed it. Once I bought the shipping I printed out the slip and now the order action page is no longer available. was there somewhere else I am supposed to go to confirm the shipping or is it already done? Just want to make sure so that my sale doesn’t get canceled. Anything help thanks.