Does Avis require an additional driver (hassle dealt with and fee paid, as opposed to an automatic additional operator like a spouse) have a credit card in their own name? The website is unclear on the topic. In the distant past when I rented from Hertz they only required the additional driver show their license and sign the contract, no credit card required.

A secondary question is whether or not Avis is like Hertz and can do the addon at a different location later in the rental period, after the car has already been rented.