PayPal\Api\AlternatePayment::getExternalCustomerId PHP Method

    public function getExternalCustomerId()
    {
        return $this->external_customer_id;
    }

 /**
  * @depends testSerializationDeserialization
  * @param AlternatePayment $obj
  */
 public function testGetters($obj)
 {
     $this->assertEquals($obj->getAlternatePaymentAccountId(), "TestSample");
     $this->assertEquals($obj->getExternalCustomerId(), "TestSample");
     $this->assertEquals($obj->getAlternatePaymentProviderId(), "TestSample");
 }