We are using FCM normally.
I am curious if there is anything special that needs to be done in the app(iOS & Android & Flutter) when migrating from existing HTTP to HTTP v1.
I looked up the official Firebase documentation, and it said to update payloads, endpoints, etc. only on the server side.
2
Answers
The migration described here only affects the API calls to send messages. It does not affect any client-side APIs or components that are used to receive messages.
Also see the last section of my (longer) answer here: The legacy Firebase Cloud Messaging (FCM) API is deprecated. what does it mean
Your developers failed to follow best practices and use Google client libraries to interact with Google Services.
Do not migrate to the HTTPv1 API. Instead, Use The Firebase Admin SDK.