Gamshare

Gamesharing only requires that you set a console as your Home console. They would not have access to my of your account details unless you gave then your account information which is never a good idea.

Hi

If you have given them your password, then they can certainly make purchases using your account information. They can't see your credit card number.

Hello, My name is Jesse. I'm an Independent Advisor and a member of the Microsoft community and I'd love to assist you today.

In my experience, not all Activision DLCs are sharable. You'll need to purchase your own copy of those ones to play.

Side Note: The game in question is “Call Of Duty: Black Ops 3”, and only “Zombie Chronicles” and “The Giant” work, everything else including the actual DLC packs don’t work.

If you have permission from whoever you are gamsharing with to make your console the home console to gameshare then yes. If not, then no.

I'm not exactly sure I even understand your question... its kind of vague.