Eduardokum\LaravelBoleto\Boleto\Render\Pdf::addBoleto PHP Method

    public function addBoleto(BoletoInterface $boleto)
    {
        $this->totalBoletos += 1;
        $this->boleto[] = $boleto;
        return $this;
    }

 /**
  * Render PDF
  *
  * @param bool   $print
  *
  * @return string
  * @throws \Exception
  */
 public function renderPDF($print = false)
 {
     $pdf = new Pdf();
     $pdf->addBoleto($this);
     return $pdf->gerarBoleto('S', null, $print);
 }