Stable release of sub-modules for logging users in from Patreon, controlling node access by Patreon user status and displaying Patreon Stats as tokens. This should be the last release of the 7.x-1 branch as the next release will hopefully be a port back of the Drupal 8 version of the module, which will introduced improved functionality (and reduce the burden of supporting two entirely different codebases).
This is Development release. Although working successfully with some live Drupal projects.
I suppose you can use this module as it is, Please post any issue bug you found I will try to resolve them on high priority..
Module configuration is 2 steps configuration for web and for mobile you need to configuration mobile app on https://console.firebase.google.com/ and ned to install and configure services with REST API server module before using web service to register FCM token.