invoiceninja/app/Http/Requests/ClientPortal/RegisterRequest.php

<?php

namespace App\Http\Requests\ClientPortal;

use Illuminate\Foundation\Http\FormRequest;

class RegisterRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        // Place to double check if key is okay, do company allow direct registrations, etc..

        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'email' => ['required', 'string', 'email', 'max:255', 'unique:client_contacts'],
            'password' => ['required', 'string', 'min:6', 'confirmed'],
        ];
    }
}