Please be as specific as possible when letting us know what is missing or incorrect. For example, say "this game's trophy difficulty should be 8/10", with a link to a website corroborating this difficulty estimate (if possible), not "this game's trophy difficulty is wrong".
Use Credits to build Blueprints, upgrade to Rocket Pass Premium, and purchase content from the Rocket League Item Shop! Make your Battle-Car your own with in-game items that can be purchased with Credits!
After purchase, a temporary 'trade hold' will be placed on all credits in your account inventory. Please visit https://support.rocketleague.com for more information.