What details can be updated by the buyer for subscriptions and ad hoc agreements?

What details can be updated by the buyer for subscriptions and ad hoc agreements?

The buyer is able to update the card and cancel the agreement. 

Please note: This is only possible if the buyer's wallet is enabled and they have a username and password to be able to login. Should this not be the case, they can contact Support on 0213004455 to further assist.