Which things would i be able to exchange, and Rocket League Credits which not?
You can exchange uncovered Blueprints, things worked from Blueprints, free Dropd, credits, Pro and Free level Rocket Pass things, and occasion things. You can't exchange concealed Blueprints, things purchased from the in-game shop, extra blessings, Esports Shop things, DLC things, normal things, Premium level Rocket Pass things, and serious season rewards. Credits likewise can't be exchanged to no end.
What packs Buy Rocket League Items are there in Rocket League?