InvoiceShelf/app/Http/Requests/DeleteMemberRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

class DeleteMemberRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     */
    public function authorize(): bool
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     */
    public function rules(): array
    {
        return [
            'users' => [
                'required',
            ],
            'users.*' => [
                'required',
                Rule::exists('users', 'id'),
            ],
        ];
    }
}