https://developers-dot-devsite-v2-prod.appspot.com/wallet/retail/gift-cards/use-cases/redemption-methods
Redeem a Gift card | Gift cards | Google for Developers
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https://support.microsoft.com/en-us/account-billing/redeem-a-gift-card-or-code-to-your-microsoft-account-d6b2c675-9e31-f312-7ff4-21834ad22fa8?icid=gift-card-page_R2_CP2_RedeemGC_060222
Redeem a gift card or code to your Microsoft account - Microsoft Support
Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.
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https://developers.google.com/wallet/retail/gift-cards/use-cases/redemption-methods
Redeem a Gift card | Gift cards | Google for Developers
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