Can you supply subscriptions with different access level?

• Can you supply subscriptions with different access level?
  • Yes
  • A subscription group can contain several subscription levels
  • Each level can have several subscriptions
  • You can make different levels having different level of accessible contents
• When user switch between different level in a subscription group, what will happen?
  • If this is an upgrade , user need pay the high price - lower price and immedietely upgrades to high level
  • When downgrade, it will take effect on the next period
  • When in the same level, if this is in the same level, and the period is the same, the change takes effect immedietely, or next period if not.
• Can you make one of your subscription not available in some country?
  • No
  • You can make your app not available in some country
• What is escaping for closure in Swift?
  • When a closure it passed to a function, and can be called after function returned, the closure should be marked as @escaping.
  • For example, you pass a closure to a function of an object, and the object stores the closure as variable for future calling.