To activate a product key at Walmart, you first need to log in to your account Walmart, and then follow these steps:

1. Click “Account” in the upper-right corner.

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2. Select “Wallet” and then click “Gift Card”.

3. Enter the 16-digit identification number and the four-digit PIN code.

4. Enter the name of the gift card and click “Save Card”.

That’s all! All information will be saved in your Walmart account for future purchases.