Enable the Extension

• Navigate to Stores > Configuration > SunArc > Push Notification in Magento Admin Panel. 
• General Configuration screen opens. 
• Enable: Choose Yes to enable the effect of Push Notification
• Click on the notification type for which notifications( New Order,New customer registration ,new product review and new contact us query)are needed 
• The firebase account  should be created and a project should be created on the firebase after the account creation.
• The details of the firebase account should be provided in magento configuration settings.
• Click on ‘Save Config’ to save the configuration settings.