How do I use an Apple Card on an iMac?

Ahh, that told me how to find out what my card number, expiration date, and 3-digit code are, so I can treat it like a regular card.

I haven't had a desire to use it except at the Apple Store, but with the Apple Stores being closed, I would like to use it on-line to buy Apple products. (I strongly suspect I wouldn't get my Apple Discount using it to buy Apple Products at my local Mac Shack or Best Buy).

It would be nice if the next iMac had some kind of biometric sensor so I could use that card the way I use Apple Pay!