PayPal\Api\PaymentHistory::getNextId PHP Method

    public function getNextId()
    {
        return $this->next_id;
    }

 /**
  * @depends testSerializationDeserialization
  * @param PaymentHistory $obj
  */
 public function testGetters($obj)
 {
     $this->assertEquals($obj->getPayments(), PaymentTest::getObject());
     $this->assertEquals($obj->getCount(), 123);
     $this->assertEquals($obj->getNextId(), "TestSample");
 }