How to delay asking the user for ios Notification permissions

Follow

Hi, We want to prompt for notifications permission at a later point after we put up an explainer. How do I do that?

Do I set requestAuthorizationToUseNotifications to NO on the Config? Docs say I must ask for permission myself if I do that. What do I call? Is there an SDK call I have to make to request permissions that will prompt the user or do I use the UNNotificationCenter requestAuthorizationWithOptions. Do I have to call updateRegistration if I use UNNotificationCenter?. 

Thank you