Creates new notification channels and updates existing ones. Updateable parameters include channel name, description, and default. This method requires your development API clientKey.
Leanplum will not interfere with any channel defined directly in your app code or by other mobile marketing providers. For instance, if your app has both a “Promotions” channel and a “Transactional” channel, but your marketer should only have access to Promotions, then you should only send that channel to Leanplum.