I am currently working on the billing engine for a website. There is a scenario in the business logic that forces me to determine if a user is currently a member of the site and if so, copy their current billing profile to a new billing profile, credit card and all of the other fields. From this point, get the new billing profile and keep just keep track of both.
I am trying to keep the user from having to re-enter their billing information. I have reviewed the doc. but am unable to see how this could be done without keeping a copy of the credit card information on my system and that is not what we want to do.
For a credit card funded billing profile you can use one of the transactions of your current profile in an API call as a reference to create a new profile.