How to create and add Google Place API Key?

Due to changes in Google Maps API, it’s required to use an API key for the BuddyPress Check-ins plugin to work properly. You can get the API key here.
Get an API Key from the Google API Console- 
Click the button below, which guides you through the process of registering a project in the Google API Console, activates the Google Maps JavaScript API and any related services automatically, and generates a generic, unrestricted API key.
Tip: During development and testing, you can register a project for testing purposes in the Google API Console and use a generic, unrestricted API key. When you are ready to move your app or website into production, register a separate project for production, create a browser-restricted API key, and add the key to your application.
Premium Plan customers: For production-ready apps, you must use a browser-restricted API key that is set up in the Google Maps APIs Premium Plan project created for you when you purchased the Premium Plan. Alternatively, you can use a client ID in combination with URL registration (instead of an API key).
For more information, see the detailed guides below for Standard Plan and Premium Plan customers.
You can also check the details here.
Update on May 26, 2022