you bought Rocket League before the Rocket League Items allowed to-play update, you can overlook this limitation.

You can exchange with players on a similar stage as you, but since Rocket League has cross-movement, you can sign in to any stage to see your tradeable things. There are a few things you can't exchange, including concealed Blueprints, things bought from the shop, and extra presents. Likewise, you can't exchange credits for credits or credits in vain. It must be credits for a thing, and just a single player can offer credits.

Whenever you've observed an exchanging accomplice, interface up on a similar stage and welcome the player to your party in Rocket League. Then, at that point, select the player and pick Invite to Trade. When Rocket League Items Shop the two players have added their exchange things and affirmed them, a commencement will start. You can in any case drop the exchange during this commencement. Whenever it's done, you'll have your new things.