Get the id of the current model

use App\Models\User;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Hash;
use Illuminate\Auth\Events\Registered;
use App\Providers\RouteServiceProvider;
use Illuminate\Support\Facades\Validator;
use Illuminate\Foundation\Auth\RegistersUsers;

class RegisterController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Register Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles the registration of new users as well as their
    | validation and creation. By default this controller uses a trait to
    | provide this functionality without requiring any additional code.
    |
    */

    use RegistersUsers;

    /**
     * Where to redirect users after registration.
     *
     * @var string
     */
    protected $redirectTo = '/shop';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest');
    }

    /**
     * Get a validator for an incoming registration request.
     *
     * @param  array  $data
     * @return \Illuminate\Contracts\Validation\Validator
     */
    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => ['required', 'string', 'max:255'],
            'surname'=>['required', 'string', 'max:255'],
            'phone'=>['required', 'string', 'max:25'],
            'isAdmin'=>['string', 'required'],
            'email' => ['required', 'string', 'email', 'max:255', 'unique:users'],
            'password' => ['required', 'string', 'min:8', 'confirmed'],
        ]);
    }

    /**
     * Create a new user instance after a valid registration.
     *
     * @param  array  $data
     * @return \App\Models\User
     */
    protected function create(array $data)
    {

        return User::create([
            'name' => $data['name'],
            'surname'=>$data['surname'],
            'phone'=>$data['phone'],
            'isAdmin'=>$data['isAdmin'],
            'email' => $data['email'],
            'password' => Hash::make($data['password']),
        ]);

        
    }

<?php

namespace App\Http\Controllers;

use App\Models\Shop;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Redirect;

class ShopController extends Controller
{
    
    public function __construct()
    {
        $this->middleware('auth');
    }

    public function shop(){
        return view('newshop');
    }


    public function newShop(Request $req){

        $shop = Shop::create([
            'name' => $req->input('name'),
            'address'=> $req->input('address'),
            'vat_number' => $req->input('vatnumber'),
            'legal_name' => $req->input('legalname'),
            'legal_address' => $req->input('legaladdress'),
            'fiscal_code' => $req->input('fiscalcode'),
            'user_id' => Auth::user()->id
        ]);

        return Redirect::route('home');
    }
}

<?php

namespace App\Http\Controllers;

use App\Models\Shop;
use App\Models\User;
use App\Models\Employee;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Crypt;
use Illuminate\Support\Facades\Redirect;
use Illuminate\Contracts\Encryption\DecryptException;

class employeesController extends Controller
{
    public function __construct(){
        $this->middleware('auth');
    }

    public function employees(){
        $employees = Employee::all();
        return view('employees', compact('employees') );
    }


    //create a new employee instance and a new user for the employee to login

    public function newEmployee(Request $request , Shop $shop){

        dd($this->shop);

        //Create a new password 18 Char
        $psw = User::random_psw();

        //create a new user instance for the employee to login
        $user = User::create([
            'name' => $request->input('name'),
            'surname' => $request->input('surname'),
            'phone' => $request->input('phone'),
            'isAdmin'=> 0,
            'email'=> $request->input('email'),
            'password' => Crypt::encryptString($psw),
        ]);


        // Create a new Employee instance 
        Employee::create ([
            'name' => $request->input('name'),
            'surname' => $request->input('surname'),
            'phone' => $request->input('phone'),
            'email'=> $request->input('email'),
            'role'=> $request->input('role'),
            'user_id'=>$user->id,
            'shop_id'=>//HERE I NEED TO INSERT THE CURRENT SHOP ID WHERE THE EMPLOYEE IS BEING CREATED,
        ])->save();

        $a = $user->password;

        try{
            $decrypt = Crypt::decryptString($a);
        }catch(DecryptException $e){

            echo 'Decryption error';
        }


        return Redirect::back();
    }
        //update employee data from DB

    public function employeeUpdate(Request $request){
        $employee = Employee::find($request->id);

        $employee->name = $request->input('name');
        $employee->surname = $request->input('surname');
        $employee->email = $request->input('email');
        $employee->phone = $request->input('phone');
        $employee->role = $request->input('role');

        $employee->save();

        return Redirect::back();
    }

    public function employeeDelete(Request $request){
        $employee = Employee::find($request->id);

        $employee->delete();

        return Redirect::back();
    }
}