In one sentence, describe what the following article is about:

It's a grey wallet with red, yellow, green, and blue cards in it. You'll find it on your home screen or inside of a folder. You can also add cards in the Settings app. Just tap Wallet & Apple Pay, select Add Card, and then skip to step 3. It's in the top-right corner of the screen. This option is at the bottom of the screen. Once you see a rectangular frame appear on-screen, you can proceed. If your iPhone assumes you're trying to add a card that you've used in the past, you can tap Add a Different Card to get to this screen. Your card's name, number, and expiration date should be facing up. Point your iPhone's camera at the card—making sure to line the edges of the card up with the inside edges of the rectangular frame—and hold your iPhone steady until the card scans. It's in the top-right corner of the screen. If you notice that any of the card information on this page is inaccurate, fix it before tapping Next. Tap the "CVV" text box, then type in the three-digit code found on the back of your card. You'll find this in the top-right corner of the screen. It's in the bottom-right corner of the screen. Some banks will require you to verify your card by sending a code to your phone via a text message. If prompted to verify your card, do the following:  Check the "Text Message" option. Tap Next. Retrieve the verification code from the text message. Enter the code into the Wallet app. Tap Done. If you ever need to change anything about your card, such as your billing address, open the Settings app, tap Wallet & Apple Pay, and then select the card.

Summary:
Open the Wallet  app. Tap ＋. Tap Continue. Wait for the camera screen to appear. Lay your card face-up on a flat surface. Scan your card's front. Tap Next. Enter your card's CVV. Tap Next. Tap Agree when prompted. Verify your card. Manage your card through the Settings  app.