Fcm Push Configuration Builder
interface FcmPushConfigurationBuilder
FcmPushConfigurationBuilder class is a builder used to provide configuration for Firebase Push Notifications using Firebase Cloud Messaging.
Use PushConfiguration.fcmPushConfigurationBuilder to create a builder instance. This builder should be used to specify:
FCM Sender ID.
FCM Registration Token.
For more extensive information on how to configure in app push notifications for incoming call see Push Notifications section of the online docs.