To claim a code on Battle.Net App.
Open the games tab, click the “Redeem a Code” button found under the logo of any game. From the “Shop” tab, click “Services” and then “Redeem a Code”
To claim a code on Battle.Net website.
Log into your account on https://account.blizzard.com/overview.
Enter the code in the Redeem Code box and click “Redeem Code”
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