While most physical Nigerian stores do not accept foreign gift cards, you can use international gift cards for:
Online shopping (e.g. Amazon, eBay)
App store purchases (Apple, Google Play)
Gaming and subscriptions (Steam, PlayStation, Xbox, RazerGold)
Travel and experiences (Airbnb)
Crypto trading (Binance)
To make the most of them, use these gift cards online or sell them for cash on Nosh if you do not need them.