The coin and network rundown, there are twelve options
Someone asked which crypto you can actually use, so here is the rundown I pieced together while paying for store credit over a few weeks. There are twelve coin and network combinations in total, which is more flexibility than I expected.
On BuyGiftCards you get USDT on TRC20, BEP20, ERC20 and Solana, USDC on BEP20, ERC20 and Solana, plus BTC, ETH, BNB, SOL and LTC. USDT on TRON is the quickest for me, roughly a minute to confirm, and all of it is checked automatically around the clock. You top up first, then buy the card from your balance.
The one thing I would stress, match the network exactly to what you select, because sending USDT over the wrong chain is a classic way to lose a deposit. Also remember it is a store rather than the brand itself, so the codes are legit retail stock, not official direct issue.