get
Method that should return the notification channel id that should be Note that it might be called on any API level, even ones lower than O.
If this method throws an exception, Batch will use the value of deductedChannelId.
Return
The channel ID to use for this notification. If you return null, deductedChannelId will be used.
Parameters
payload
Full push payload. Read your custom payload as string values, using getString on getPushBundle
deducted
Channel ID