xshop/app/Http/Controllers/Api/VisitorController.php

<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Visitor;
use Illuminate\Http\Request;

class VisitorController extends Controller
{
    //
    public function display(Request $request){
        $visitor = Visitor::where('ip', $request->ip())->orderByDesc('id')->first();
        if ($visitor != null){
            $visitor->display = $request->input('display',null);
            $visitor->save();
        }
        return ['OK'=>true];
    }
}