Register a push token for the given auth token.
API Key with fullAccess scope(i.e. Rest API Key from the Dashboard).
Response data
fcm_android, fcm_ios, fcm_web, fcm_flutter_android, fcm_flutter_ios, fcm_react_native_android, fcm_react_native_ios, fcm_ionic_cordova_android, fcm_ionic_cordova_ios "fcm-provider-2"
"superhero3_1710141033938cf7e3c67cc44465440d"
"Asia/Kolkata"