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1) Input your "Player ID" on the Asphalt 9: Legends website https://www.gameloft.com/redeem/asphalt-9-redeem. You can also access it by clicking on "Redeem Code" directly in the settings of Asphalt 9 (except on iOS).
2) Once your player ID is verified, you will be asked to input your Amazon Prime Gaming Code, do it and you'll receive your content.