REST API call to mark notification as read

HI mfeltscher 

As per my knowledge its not possible to set user notification using rest api but it can be achiveable using jquery. I have done the same part. i.e. facebook shows notification on top of the page. I achived it using jquery. Following is the code. Hope it may help you:

;( function( $, undefined )
{
    $.fn.UserNotifications = function()
    {
        var $item   = $( '#user-notifications-menu-top' )
          , $list   = $item.find( '#notification-list' )
          , unread  = parseInt( $item.find( '.user-navigation-combine-notification-feed .lia-header-nav-component-unread-count' ).text() )
          , pageURL = $item.find( '.user-navigation-combine-notification-feed .lia-link-navigation' ).attr( 'href' );

        $item.find( '#alerts-count' ).text( unread );
        $item.find( '#notifications-page-link' ).attr( 'href', pageURL );
    
        if( unread > 0 )
        {
            $item.addClass( 'new-notifications' );
            $list.find( 'li:lt( ' + unread + ' )' ).addClass( 'unread' );
        }
        else
        {
            $item.addClass( 'no-new-notifications' );
        }
    };

} )( jQuery );

Note: Also you need to make some css per code.