I just successfully ordered from them using bitcoin. If you send it from a non-custodial wallet it will go through. A non-custodial wallet is a wallet where you have the bitcoin localy. When you send bitcoin through a custodial wallet the exchange controls the transaction. Cash app, coinbase, robinhood are examples of custodial wallets (they have custody). Those companies are good places to buy bitcoin but you should send it to your own personal non-custodial wallet before spending it. There are many good non-custodial wallets. I like Muun wallet. It is simple and easy to use. It will only hold bitcoin so you will need a different wallet if you want to pay with another crypto.