this is my UserController.php in Laravel backend & react front-end app

 <?php

    namespace AppHttpControllers;

    use AppHttpControllersController;
    use IlluminateHttpRequest;

    class UserController extends Controller
    {
        //
        function register(Request $req)
        {
            return "helooooo";
        
        }
    }

my route/api.php is as bellow

<?php

use IlluminateHttpRequest;
use IlluminateSupportFacadesRoute;
use AppHttpControllersUserCntroller;

Route::middleware('auth.api')->get('user',function(Request $request){

    return $request->user();
});

Route::post('register',[UserCntroller::class,'register']);'

but it does not show above “heloooo” message in POSTMAN
in postman url http://localhost:8000/api/register

can someone please help ?