Can I withdraw Apple Cash at an ATM machine?

The Apple Cash card is virtual only, so no you can’t make ATM witdwawals using it.

The Apple Card does not allow cash advances at all.

The Apple Card does not have a PIN; it’s protected by the device’s Face/Touch ID. (a pre-req for card issuance)

Missed an answer; no PIN for physical Apple Card.

Hi,

If you're paying with Apple Cash in the United States, authenticate with Face ID, Touch ID, or a secure passcode. Some terminals may still request a PIN to complete any debit transaction. If prompted, just enter 0000 or any other four-digit code.

Apple Support - How to Use Apple Pay

https://support.apple.com/en-us/HT201239

I hope this helps.