How to overdraft on apple wallet.

Since the Apple Wallet has no balance or credit limit itself, no, there is no way to overdraft in Wallet. Wallet is just a way to store your credit or debit cards. It is not an account, nor does it have a credit limit itself.

You may however, overdraft any of the credit or debit cards added to the Wallet App as you would normally by using the credit card or debit cart past its limit or balance if the issuer allows for overdrafting.

You cannot overdraft the Apple Cash account though. As it will decline any purchases that go past the amount available in it.

Can you overdraft on your debit card? If so, then yes. If not, then no. It's exactly the same as using the card, only using a more secure authentication method.