invoiceninja/app/Http/Requests/RecurringInvoice/StoreRecurringInvoiceRequest.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com)
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Http\Requests\RecurringInvoice;

use App\Http\Requests\Request;
use App\Models\RecurringInvoice;

class StoreRecurringInvoiceRequest extends Request
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */

    public function authorize() : bool
    {
        return auth()->user()->can('create', RecurringInvoice::class);
    }

    public function rules()
    {
        return [
            'documents' => 'mimes:png,ai,svg,jpeg,tiff,pdf,gif,psd,txt,doc,xls,ppt,xlsx,docx,pptx',
            'client_id' => 'required|integer',
        ];
    }


    protected function prepareForValidation()
    {
        //do post processing of RecurringInvoice request here, ie. RecurringInvoice_items
    }

    public function messages()
    {
    }
}