After paying my Iphone off in full, is there anything I need to do before trading it in at Apple?

Hey there! So my iPhone 12 Pro Max that I originally did a 24 month payment plan on is fully owned by me now. I want to trade it in for an iPhone 15 pro through apple since they will give me $100 more than T-Mobile since we have an older grandfathered in Sprint plan, and I just wanted to make sure there wasn't anything that I had to do with my account or anything before I try to do a trade in. I would hate to reserve a phone for pickup just to not be able to trade in my phone. ¡Gracias!