public function setWithPayer($withPayer = true)
    {
        $this->isBool($withPayer, 'withPayer');
        $this->withPayer = $withPayer;

        if ($withPayer === false) {
            $this->payerLine1 = '';
            $this->payerLine2 = '';
            $this->payerLine3 = '';
            $this->payerLine4 = '';
        }

        return $this;
    }