setChannelPushPreference
Sets the push notification preference level for a specific channel.
Return
Executable async Call responsible for setting the channel's push preference. Returns a PushPreference object containing the updated preference settings on success.
Parameters
cid
The full channel identifier (e.g., "messaging:123") for which to set the preference.
level
The notification level to set for this channel. Available options: PushPreferenceLevel.all, PushPreferenceLevel.mentions, PushPreferenceLevel.none