What is an API key on app?

An API key or application programming interface key is a code that gets passed in by computer applications . The program or application then calls the API or application programming interface to identify its user, developer or calling program to a website.

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What is FCM API key?

With FCM credentials you can set up Web Push Notification service in your site. The API key is stored securely and used by the Push Notifications service to connect to the FCM server and the sender ID (project number) is used by the Android SDK and JS SDK for Google Chrome and Mozilla Firefox on the client side.30 Kas 2016

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