Use APKPure App
Get FCM Tester - Push Notification old version APK for Android
If you're a fan of FCM, then it is the right tool to test your push notification
FCM Tester is a simple, materialistic app to test your firebase push notifications.
Just
• Paste your server key
• Paste device token or enter topic name
• Select the type of notification ( Normal or Json - Custom )
• Done!!! ☺.