Generate FCM Token in ionic 1

for getting firebase token do this

  if (window.FirebasePlugin) {
           var Token
            // window.FirebasePlugin.grantPermission(); //in ios
            window.FirebasePlugin.getToken(function (token) {

                Token = token;
                console.log(token);
            }, function (error) {

            });

            window.FirebasePlugin.onTokenRefresh(function (token) {

                Token = token;
                console.log(token);


            }, function (error) {

            });
        }

hopping that
1)Your created android project in firebase console ( and downloaded google-services.json file)
2) using firebase pluggin etc