I have some questions about migration to FCM. We’ve got an information from google about final term to migrate to FCM.
Google said that we have about many requests to GCM. Actually we have an authorization in azure notification hub via FCM token.
I was sure that when we started to use FCM token we also started to use FCM, not GCM.
So, I have two questions about migration to FCM.

1. Should I change arm configuration, I have a configuration as below.

`{ "gcmCredential": { "properties": { "googleApiKey": "[parameters('apiKey')]" } }`
2. We are using azure notification hub only by our backend systems via rest api. Endpoint for direct push send, have a header 'Content-Type' which we set to 'GCM'. Should we change this value to FCM?

Could you please give me recommendation what I need to do, to switch GCM to FCM.