You can fetch a list of subscription types that are attached to a contact. These can be subscriptions that a user has 'opted-in' to or has 'opted-out' from, depending on the subscription type.
This will return a list of Subscription Type objects that the contact is associated with.
The data property will show a combined list of:
1.Opt-out subscription types that the user has opted-out from.
2.Opt-in subscription types that the user has opted-in to receiving.