If you want to sell gift cards, the best choice is the tbay gift card trading platform. Tbay is a global professional gift card trading platform.
How to sell gift card:
1.Register and login Tbay:  https://h5.theiabay.com/?flag=sell#/ Visit “Gift Card Trade” section, select “Sell gift card”. Select the gift card type, such as Steam gift card, check the order list
2.You can rank the order list, and select the one you want to trade with
3.After placing an order, enter face value of the card and upload your gift cards images, click “Sell Now”
You can find the record of your income in wallet page
Note
1.Do not sell invalid card or umcatched card, otherwise you will lose in dispute
2.Your account will be blocked for fraud trading
3.Gift card sellers will get compensation which is 10 times as much as order amount.

How to exchange USDT for Naira

1.Register and login Tbay:  https://h5.theiabay.com/?flag=usdt#/ Visit “OTC Trade” section, select “Sell USDT”.
2.You can rank the order list, and select the one you want to trade with
3.Read the offer terms before placing an order, then enter the amount of USDT you want to sell
4.Set a receiving account (If it’s your first time to trade USDT, please set your receiving account first.)
5.Fill the required information, click “Sell Now”
6.Check order information
7.Release USDT after you have confirmed the remittance

Note
1.Do not release USDT before confirming
If you do not release USDT after receiving the payment, trade partner could open a dispute against you.

I can understand gift cards byt what is USDT and OTC

Thanks

How does it answer this public question sir