public function testSerializationDeserialization()
{
$obj = new PaymentCardToken(self::getJson());
$this->assertNotNull($obj);
$this->assertNotNull($obj->getPaymentCardId());
$this->assertNotNull($obj->getExternalCustomerId());
$this->assertNotNull($obj->getLast4());
$this->assertNotNull($obj->getType());
$this->assertNotNull($obj->getExpireMonth());
$this->assertNotNull($obj->getExpireYear());
$this->assertEquals(self::getJson(), $obj->toJson());
return $obj;
}