Answer:
cash 50 debit
unearned revenue 50 credit
Explanation:
The sale of the gitf card is done in january. The information of February's transaction is not relevant to decide how to record this sale.
The sales was in cash, so the company receive cash, this account will increase by 50.
Also the company will recognize the unearned revenue, this is not earned yet. It will be earned when redeemed.