Android: FCM Setup (v1)

In your Firebase Project, click on the top left gear button and select 'Project Settings'.

At 'Cloud Messaging' tab, enable 'Cloud Messaging API (V1)' and check your Sender ID

If disabled, click the right 3-dot button and enable it.

At 'Service accounts' tab, generate your private key.

At FlareLane Channels > App Push > Push Certificate > FCM input fields, enter the Sender ID and upload your Service Account JSON file obtained above.

If you have a test device, you can check whether it is appropriately delivered with FCM v1 through Test Sending button. If there is no failure, it is a success.