问题 In Urban Airship, when I am composing a notification, I can target specific users by searching for a Urban Airship channel_id (device ID): I sent from Urban Airship the push notification that I am showing above, and I received it successfully. Now I want to do the same thing, send a push notification to a specific device, but now using the Firebase console. The problem is that in Firebase, in the step where I need to specify the target , it only allows me to choose User segment or topic . I