Consider creating your own FCM key, which will give you full control over your subscriber list(s). If you don’t have one yet, the default Push Monkey keys will be used.
If you have your own FCM Project Number and API key, please follow the following steps to connect your Push Monkey account with Firebase Cloud Messaging Service:
1. Go to FCM/GCM Keys under settings on your Dashboard
After logging in to your Push Monkey Dashboard, click on "FCM/GCM Keys" under the "General Settings" item on the left navigation menu.
2. Enter the FCM Sender ID & FCM API Key
Enter the requested details in their respective fields and click the Save button.
3. Now you have full control over your Subscriber list