public function setReference($reference)
    {
        if (!empty($reference) && ctype_print($reference)) {
            $this->reference = trim($reference);
        }

        return $this;
    }
public function setReference($reference)
    {
        if (!empty($reference) && ctype_print($reference)) {
            $this->reference = trim($reference);
        }

        return $this;
    }
public function setReference ( $ reference ) { if ( ! empty ( $ reference ) && ctype_print ( $ reference ) ) { $ this -> reference = trim ( $ reference ) ; } return $ this ; }
Set the payroll providers reference for this payout

@param $reference
@return $this
Set the payroll providers reference for this payout