Hi @padmalayag - Oh goodness. Duolingo does have their code redemption setup to require a credit card. If you do decide to redeem it yet don’t want to pay additional months, definitely put a reminder on your calendar to cancel your account otherwise you will get charged! 
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Hi @simi11 ! Yes, I’m afraid Duolingo’s system is setup to charge your card if you forget to cancel. 
We’ve asked Duolingo about the expiration date on the coupon they provided but we haven’t heard back. Our Marketing team advises to redeem it before end of year, just to be safe!
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So it expired. I tried to use the code before 2024 arrives… But it already expired 
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