What do I need to do to get an Apple Pay card

This article has some helpful information: https://support.apple.com/en-us/HT209434

Some highlights:

Before you request a titanium Apple Card, apply for Apple Card. If your application is approved and you accept your offer, you can request a titanium Apple Card.

1. Open the Wallet app on your iPhone and tap Apple Card.
2. Tap the more button.
3. Scroll down and tap Get a Titanium Apple Card.
4. Follow the instructions on your screen

Many credit and debit cards can be used with Apple Pay. See: Set up Apple Pay - Apple Support

If you meant an Apple Card, ee the instructions in How to apply for Apple Card - Apple Support