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If you want to make purchase in the cart using Lightning Network, you’ll need to send some BTC (for instance from your Coinbase account) to a Lightning-compatible wallet. There are dozens to choose from. Popular options include both “custodial” and “non-custodial” wallets. Here’s the difference:
Custodial wallets: Options include Strike, Blue Wallet, and Wallet of Satoshi. These tend to be good for beginners, because they simplify the sending and receiving crypto by managing your private keys. If, for instance, you lose your password, you’ll be able to reset it.