Omnipay\Common\CreditCard::setBillingPhoneExtension PHP Метод

    public function setBillingPhoneExtension($value)
    {
        return $this->setParameter('billingPhoneExtension', $value);
    }

 public function testBillingPhoneExtension()
 {
     $this->card->setBillingPhoneExtension('001');
     $this->assertSame('001', $this->card->getBillingPhoneExtension());
     $this->assertSame('001', $this->card->getPhoneExtension());
 }