src/OrangePaymentSlip.php
public function setDisplayReferenceNr($displayReferenceNr = true)
    {
        $this->isBool($displayReferenceNr, 'displayReferenceNr');
        $this->displayReferenceNr = $displayReferenceNr;

        return $this;
    }
public function setDisplayReferenceNr($displayReferenceNr = true)
    {
        $this->isBool($displayReferenceNr, 'displayReferenceNr');
        $this->displayReferenceNr = $displayReferenceNr;

        return $this;
    }
public function setDisplayReferenceNr ( $ displayReferenceNr = true ) { $ this -> isBool ( $ displayReferenceNr , 'displayReferenceNr' ) ; $ this -> displayReferenceNr = $ displayReferenceNr ; return $ this ; }
Set whether or not to display the reference number

@param bool $displayReferenceNr True if yes, false if no
@return $this The current instance for a fluent interface.
Set whether or not to display the reference number