You can top up your Fountain wallet with either Lightning or a bank card.
In Wallet, tap Send and then Deposit with Lightning. Fountain will generate an invoice that you can pay from another Lightning-enabled app such as Coinbase, Cash App, or Strike.
You can also deposit by paying your Fountain Lightning Address from any wallet that supports Lightning payments.
In Wallet, press Fund Wallet and choose Deposit with Bank Card. You will be taken to MoonPay, Fountain's payment processing partner.
Receipts are issued after two blockchain confirmations, so it may take around 20 minutes before your sats appear in your wallet. While the payment is processing, the transaction will show as pending. After two confirmations, it will change to confirmed.