You can securely obtain RL credits through the online store-Lolga.com
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Credits can be used to buy RL Items such as a player banner or a rocket trail and blueprints to unlock other items. We’ll teach you how to earn credits in Rocket League for free via external trading platforms as well as the in-game store.
Unlike many other free-to-play games, Rocket League does not allow you to earn credits just by playing. You’ll have to get them through the store instead, although there are a few options.