InvoiceShelf/app/Http/Requests/SendInvoiceRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class SendInvoiceRequest 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 [
            'body' => [
                'required',
            ],
            'subject' => [
                'required',
            ],
            'from' => [
                'required',
            ],
            'to' => [
                'required',
            ],
            'cc' => [
                'nullable',
            ],
            'bcc' => [
                'nullable',
            ],
        ];
    }
}