While Google has stated many times that it has no plans to shut down its Hangouts messaging service, it has decided to end support for its third-party developer tools. The company has quietly updated its FAQ for the Google Hangouts API, stating that no new apps will be allow to access those tools.
In addition, most of the existing apps that are currently using the Google Hangouts API will no longer work after April 25. There will be a few exceptions, which will include Google’s own Hangouts on Air broadcasting tools like Toolbox, Control Room, and Cameraman, along with business and enterprise oriented apps like Slack that integrate with the API. Finally, apps that support dialing into a call like DialPad and RingCentral will also be allowed to use the API after the expiration date.
Read more on Android Authority