public PushNotificationsController(
     ILogger <PushNotificationsController> logger,
     UserManager <IdentityUser> userManager,
     IRouteListModel aPIRouteListData,
     IFCMAPIHelper iFCMAPIHelper,
     IEmployeeModel employeeData)
 {
     _logger           = logger ?? throw new ArgumentNullException(nameof(logger));
     _userManager      = userManager ?? throw new ArgumentNullException(nameof(userManager));
     _aPIRouteListData = aPIRouteListData ?? throw new ArgumentNullException(nameof(aPIRouteListData));
     _iFCMAPIHelper    = iFCMAPIHelper ?? throw new ArgumentNullException(nameof(iFCMAPIHelper));
     _employeeData     = employeeData ?? throw new ArgumentNullException(nameof(employeeData));
 }