Request Additional Documents using PDFfiller PHP Client

With PDFfiller, you can easily identify who signs your document. Simply request additional documents that confirm their identity. Ask your recipients to attach a photo or other document before completing your signature request.
          
              
                    PDFfiller\OAuth2\Client\Provider\FillRequestForm::additionalDocuments();
$fillRequestForm = new FillRequestForm($provider, 207214123, ['id' => 85677]);
$list = $fillRequestForm->additionalDocuments();