Get available upgrade and downgrade options for a subscription item. Only available if the item has a product group assigned.
Required permissions:subscription:readPUT /subscription-items/{id}/product-group.
current: Information about the current membership and price planoptions: Available upgrade/downgrade optionshasPendingChange: Whether a change is already scheduledhasPendingChange is true, no further changes can be made until the pending change is applied.Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
SubscriptionItem identifier