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First of all, go to firebase on the internet. If you have a gmail address, you should already have an account.
Then create a new project or select your project.
Go to “project overview” and click on “project setting”.
Go to the Cloud Messaging
Click on the three small dots next to “Cloud Messaging API”. Then, click again on “Manage API in Google Cloud Consol”.
A new tab will open
Under Cloud Messaging press “Enable”.
Return to the firebase page and refresh it
This key is the server key. Go back to Wiresk and enter this key in your FCM connection