how do I make a payment to my Apple Card with no iPhone

See the following Apple Support article for information on making Apple Card payments without an iPhone by using an internet browser. Go to https://card.apple.com/ as described in Pay your Apple Card balance online - Apple Support

This may help if you have additional issues.

>> If your iPhone or iPad is unavailable

If your iPhone is missing or stolen, you can contact Apple Support to make a payment. You can also ask an Apple Card specialist to help you set up scheduled payments so you don't miss a payment.

If you added your Apple Card to another iPhone, you can make a payment or set up scheduled payments in the Wallet app on that iPhone. If you added your Apple Card to your iPad, you can go to Settings > Wallet & Apple Pay > Apple Card, then tap Make a Payment or set up Scheduled Payments <<.

How to make Apple Card payments - Apple Support