Use Apple Pay
Apple Pay is a fantastic way to keep all your credit cards in one place. Not only that, but it also lets you use your iPhone to pay for anything, so long as the place you’re in supports Apple Pay.
After you’ve registered your credit card in the Wallet app, you can access it immediately by quickly pressing the side button twice. Afterward, you’ll need to verify it’s you with Face ID, and you’ll be able to pay with your iPhone. This also works for quickly accessing other items in your Wallet, such as tickets, boarding passes, or loyalty cards.