diff --git a/.travis.yml b/.travis.yml
index fc93903..38318c1 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: php
 php:
+  - "5.5"
   - "5.6"
   - "7.0"
   - "7.1"
diff --git a/README.md b/README.md
index e96a372..6b7d3f4 100755
--- a/README.md
+++ b/README.md
@@ -98,18 +98,20 @@ Or [Using a service account](https://developers.google.com/android-publisher/get
 Create service account [Service Account flow](https://developers.google.com/identity/protocols/OAuth2ServiceAccount)
 
 ```php
-use ReceiptValidator\GooglePlay\ServiceAccountValidator as PlayValidator;
-$validator = new PlayValidator([
-    'client_email' => 'xxxxxx@developer.gserviceaccount.com',
-    'p12_key_path' => 'MyProject.p12',
-]);
+$googleClient = new \Google_Client();
+$googleClient->setScopes([\Google_Service_AndroidPublisher::ANDROIDPUBLISHER]);
+$googleClient->setApplicationName('Your_Purchase_Validator_Name');
+$googleClient->setAuthConfig($pathToServiceAccountJsonFile);
+
+$googleAndroidPublisher = new \Google_Service_AndroidPublisher($googleClient);
+$validator = new \ReceiptValidator\GooglePlay\Validator($googleAndroidPublisher);
 
 try {
   $response = $validator->setPackageName('PACKAGE_NAME')
-    ->setProductId('PRODUCT_ID')
-    ->setPurchaseToken('PURCHASE_TOKEN')
-    ->validate();
-} catch (Exception $e){
+      ->setProductId('PRODUCT_ID')
+      ->setPurchaseToken('PURCHASE_TOKEN')
+      ->validateSubscription();
+} catch (\Exception $e){
   var_dump($e->getMessage());
   // example message: Error calling GET ....: (404) Product not found for this application.
 }
diff --git a/composer.json b/composer.json
index afb2d1b..d5b6042 100755
--- a/composer.json
+++ b/composer.json
@@ -26,14 +26,14 @@
     "Apache-2.0"
   ],
   "require": {
-    "php": ">=5.6",
+    "php": ">=5.5",
     "guzzlehttp/guzzle": "~6.2",
     "nesbot/carbon": "~1",
     "google/apiclient": "~2.0",
     "robrichards/xmlseclibs": "^2.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^5.7"
+    "phpunit/phpunit": "^4.8||^5.7"
   },
   "autoload": {
     "psr-4": {
diff --git a/src/GooglePlay/AbstractResponse.php b/src/GooglePlay/AbstractResponse.php
index db7204c..a7e1c9c 100644
--- a/src/GooglePlay/AbstractResponse.php
+++ b/src/GooglePlay/AbstractResponse.php
@@ -8,78 +8,47 @@
  */
 abstract class AbstractResponse
 {
-  const CONSUMPTION_STATE_YET_TO_BE_CONSUMED = 0;
-  const CONSUMPTION_STATE_CONSUMED = 1;
-  const PURCHASE_STATE_PURCHASED = 0;
-  const PURCHASE_STATE_CANCELED = 1;
-
-  /**
-   * @var \Google_Service_AndroidPublisher_ProductPurchase|\Google_Service_AndroidPublisher_SubscriptionPurchase
-   */
-  protected $response;
-
-  /**
-   * @var array
-   */
-  protected $developerPayload = [];
-
-  /**
-   * Constructor
-   *
-   * @param \Google_Service_AndroidPublisher_ProductPurchase|\Google_Service_AndroidPublisher_SubscriptionPurchase $response
-   */
-  public function __construct($response)
-  {
-    $this->response = $response;
-    $this->developerPayload = json_decode($this->response->developerPayload, true);
-  }
-
-  /**
-   * @return int
-   */
-  public function getConsumptionState()
-  {
-    return $this->response->consumptionState;
-  }
-
-  /**
-   * @return array
-   */
-  public function getDeveloperPayload()
-  {
-    return $this->developerPayload;
-  }
-
-  /**
-   * @param string $key
-   * @return string
-   */
-  public function getDeveloperPayloadElement($key)
-  {
-    return (isset($this->developerPayload[$key])) ? $this->developerPayload[$key] : '';
-  }
-
-  /**
-   * @return string
-   */
-  public function getKind()
-  {
-    return $this->response->kind;
-  }
-
-  /**
-   * @return string
-   */
-  public function getPurchaseState()
-  {
-    return $this->response->purchaseState;
-  }
-
-  /**
-   * @return \Google_Service_AndroidPublisher_ProductPurchase|\Google_Service_AndroidPublisher_SubscriptionPurchase
-   */
-  public function getRawResponse()
-  {
-    return $this->response;
-  }
+    const CONSUMPTION_STATE_YET_TO_BE_CONSUMED = 0;
+    const CONSUMPTION_STATE_CONSUMED = 1;
+    const PURCHASE_STATE_PURCHASED = 0;
+    const PURCHASE_STATE_CANCELED = 1;
+
+    /**
+     * @var \Google_Service_AndroidPublisher_ProductPurchase|\Google_Service_AndroidPublisher_SubscriptionPurchase
+     */
+    protected $response;
+
+    /**
+     * Constructor
+     *
+     * @param \Google_Service_AndroidPublisher_ProductPurchase|\Google_Service_AndroidPublisher_SubscriptionPurchase $response
+     */
+    public function __construct($response)
+    {
+        $this->response = $response;
+    }
+
+    /**
+     * @return array|string
+     */
+    public function getDeveloperPayload()
+    {
+        return $this->response->getDeveloperPayload();
+    }
+
+    /**
+     * @return string
+     */
+    public function getKind()
+    {
+        return $this->response->kind;
+    }
+
+    /**
+     * @return \Google_Service_AndroidPublisher_ProductPurchase|\Google_Service_AndroidPublisher_SubscriptionPurchase
+     */
+    public function getRawResponse()
+    {
+        return $this->response;
+    }
 }
diff --git a/src/GooglePlay/PurchaseResponse.php b/src/GooglePlay/PurchaseResponse.php
index e67fe0e..b6f9386 100644
--- a/src/GooglePlay/PurchaseResponse.php
+++ b/src/GooglePlay/PurchaseResponse.php
@@ -8,16 +8,54 @@
  */
 class PurchaseResponse extends AbstractResponse
 {
-  /**
-   * @var \Google_Service_AndroidPublisher_ProductPurchase
-   */
-  protected $response;
-
-  /**
-   * @return string
-   */
-  public function getPurchaseTimeMillis()
-  {
-    return $this->response->purchaseTimeMillis;
-  }
+    /**
+     * @var \Google_Service_AndroidPublisher_ProductPurchase
+     */
+    protected $response;
+
+    protected $developerPayload = [];
+
+    public function __construct($response)
+    {
+        parent::__construct($response);
+        $this->developerPayload = json_decode($this->response->developerPayload, true);
+    }
+
+    /**
+     * @return int
+     */
+    public function getConsumptionState()
+    {
+        return $this->response->consumptionState;
+    }
+
+    /**
+     * @return string
+     */
+    public function getPurchaseTimeMillis()
+    {
+        return $this->response->purchaseTimeMillis;
+    }
+
+    public function getDeveloperPayload()
+    {
+        return $this->developerPayload;
+    }
+
+    /**
+     * @param string $key
+     * @return string
+     */
+    public function getDeveloperPayloadElement($key)
+    {
+        return (isset($this->developerPayload[$key])) ? $this->developerPayload[$key] : '';
+    }
+
+    /**
+     * @return string
+     */
+    public function getPurchaseState()
+    {
+        return $this->response->purchaseState;
+    }
 }
diff --git a/src/GooglePlay/SubscriptionResponse.php b/src/GooglePlay/SubscriptionResponse.php
index 2c290e6..0fa2d28 100644
--- a/src/GooglePlay/SubscriptionResponse.php
+++ b/src/GooglePlay/SubscriptionResponse.php
@@ -8,64 +8,89 @@
  */
 class SubscriptionResponse extends AbstractResponse
 {
-  /**
-   * @var \Google_Service_AndroidPublisher_SubscriptionPurchase
-   */
-  protected $response;
+    /**
+     * @var \Google_Service_AndroidPublisher_SubscriptionPurchase
+     */
+    protected $response;
 
-  /**
-   * @return string
-   */
-  public function getAutoRenewing()
-  {
-    return $this->response->autoRenewing;
-  }
+    /**
+     * @return bool
+     */
+    public function getAutoRenewing()
+    {
+        return (bool)$this->response->getAutoRenewing();
+    }
 
-  /**
-   * @return string
-   */
-  public function getCancelReason()
-  {
-    return $this->response->cancelReason;
-  }
+    /**
+     * @return integer|null
+     */
+    public function getCancelReason()
+    {
+        return $this->response->getCancelReason();
+    }
 
-  /**
-   * @return string
-   */
-  public function getCountryCode()
-  {
-    return $this->response->countryCode;
-  }
+    /**
+     * @return string
+     */
+    public function getCountryCode()
+    {
+        return $this->response->getCountryCode();
+    }
 
-  /**
-   * @return string
-   */
-  public function getPriceAmountMicros()
-  {
-    return $this->response->priceAmountMicros;
-  }
+    /**
+     * @return integer
+     */
+    public function getPriceAmountMicros()
+    {
+        return $this->response->getPriceAmountMicros();
+    }
 
-  /**
-   * @return string
-   */
-  public function getPriceCurrencyCode()
-  {
-    return $this->response->priceCurrencyCode;
-  }
+    /**
+     * @return string
+     */
+    public function getPriceCurrencyCode()
+    {
+        return $this->response->getPriceCurrencyCode();
+    }
 
-  /**
-   * @return string
-   */
-  public function getStartTimeMillis()
-  {
-    return $this->response->startTimeMillis;
-  }
+    /**
+     * @return string
+     */
+    public function getStartTimeMillis()
+    {
+        return $this->response->getStartTimeMillis();
+    }
 
-  /**
-   * @return string
-   */
-  public function getExpiresDate()
-  {
-    return $this->response->expiryTimeMillis;
-  }
+    /**
+     * @return integer
+     */
+    public function getExpiryTimeMillis()
+    {
+        return $this->response->getExpiryTimeMillis();
+    }
+
+    /**
+     * @return integer|null
+     */
+    public function getUserCancellationTimeMillis()
+    {
+        return $this->response->getUserCancellationTimeMillis();
+    }
+
+    /**
+     * @return integer
+     */
+    public function getPaymentState()
+    {
+        return $this->response->getPaymentState();
+    }
+
+    /**
+     * @deprecated Use getExpiryTimeMillis() method instead
+     * @return string
+     */
+    public function getExpiresDate()
+    {
+        return $this->response->expiryTimeMillis;
+    }
 }
diff --git a/src/GooglePlay/Validator.php b/src/GooglePlay/Validator.php
index 943412e..545a61c 100644
--- a/src/GooglePlay/Validator.php
+++ b/src/GooglePlay/Validator.php
@@ -118,4 +118,12 @@ public function validatePurchase()
       $this->_package_name, $this->_product_id, $this->_purchase_token
     ));
   }
+
+    /**
+     * @return \Google_Service_AndroidPublisher
+     */
+    public function getPublisherService()
+    {
+        return $this->_androidPublisherService;
+    }
 }
diff --git a/tests/GooglePlay/PurchaseResponseTest.php b/tests/GooglePlay/PurchaseResponseTest.php
index 9fd31df..7cde9d5 100644
--- a/tests/GooglePlay/PurchaseResponseTest.php
+++ b/tests/GooglePlay/PurchaseResponseTest.php
@@ -8,7 +8,7 @@
 class GooglePlayPurchaseResponseTest extends \PHPUnit_Framework_TestCase
 {
     /**
-     *
+     * @link https://developers.google.com/android-publisher/api-ref/purchases/products
      */
     public function testParsedResponse()
     {
diff --git a/tests/GooglePlay/SubscriptionResponseTest.php b/tests/GooglePlay/SubscriptionResponseTest.php
index 487ea65..373f3ec 100644
--- a/tests/GooglePlay/SubscriptionResponseTest.php
+++ b/tests/GooglePlay/SubscriptionResponseTest.php
@@ -4,6 +4,7 @@
 
 /**
  * @group library
+ * @link https://developers.google.com/android-publisher/api-ref/purchases/subscriptions
  */
 class GooglePlaySubscriptionResponseTest extends \PHPUnit_Framework_TestCase
 {
@@ -12,36 +13,43 @@ class GooglePlaySubscriptionResponseTest extends \PHPUnit_Framework_TestCase
      */
     public function testParsedResponse()
     {
-        $autoRenewing = 'testAutoRenewing';
-        $cancelReason = 'testCancelReason';
+        $autoRenewing = true;
+        $cancelReason = 0;
         $countryCode = 'testCountryCode';
         $priceAmountMicros = 'testPriceAmountMicros';
         $priceCurrencyCode = 'testPriceCurrencyCode';
-        $startTimeMillis = 'testStartTimeMillis';
-        $expiryTimeMillis = 'testExpiryTimeMillis';
+        $startTimeMillis =  time() * 1000;
+        $expiryTimeMillis =  $startTimeMillis + 3600 * 24 * 7 * 1000;
+        $userCancellationTimeMillis = $startTimeMillis + 3600 * 24 * 1000;
+        $developerPayload = 'subs:developerPayload';
+        $paymentState = 1;
 
-        // mock objects
-        $subscriptionPurchaseMock = $this->getMockBuilder('\Google_Service_AndroidPublisher_SubscriptionPurchase')
-            ->disableOriginalConstructor()->getMock();
+        $data = [
+            'autoRenewing' => $autoRenewing,
+            'cancelReason' => $cancelReason,
+            'countryCode' => $countryCode,
+            'priceAmountMicros' => $priceAmountMicros,
+            'priceCurrencyCode' => $priceCurrencyCode,
+            'startTimeMillis' => $startTimeMillis,
+            'expiryTimeMillis' => $expiryTimeMillis,
+            'userCancellationTimeMillis' => $userCancellationTimeMillis,
+            'developerPayload' => $developerPayload,
+            'paymentState' => $paymentState,
+        ];
 
-        $subscriptionPurchaseMock->autoRenewing = $autoRenewing;
-        $subscriptionPurchaseMock->cancelReason = $cancelReason;
-        $subscriptionPurchaseMock->countryCode = $countryCode;
-        $subscriptionPurchaseMock->priceAmountMicros = $priceAmountMicros;
-        $subscriptionPurchaseMock->priceCurrencyCode = $priceCurrencyCode;
-        $subscriptionPurchaseMock->startTimeMillis = $startTimeMillis;
-        $subscriptionPurchaseMock->expiryTimeMillis = $expiryTimeMillis;
+        $subscriptionPurchase = new \Google_Service_AndroidPublisher_SubscriptionPurchase($data);
+        $subscriptionResponse = new SubscriptionResponse($subscriptionPurchase);
 
-        $subscriptionResponse = new SubscriptionResponse($subscriptionPurchaseMock);
-
-        $this->assertInstanceOf('ReceiptValidator\GooglePlay\AbstractResponse', $subscriptionResponse);
+        $this->assertInstanceOf(AbstractResponse::class, $subscriptionResponse);
         $this->assertEquals($autoRenewing, $subscriptionResponse->getAutoRenewing());
         $this->assertEquals($cancelReason, $subscriptionResponse->getCancelReason());
         $this->assertEquals($countryCode, $subscriptionResponse->getCountryCode());
         $this->assertEquals($priceAmountMicros, $subscriptionResponse->getPriceAmountMicros());
         $this->assertEquals($priceCurrencyCode, $subscriptionResponse->getPriceCurrencyCode());
         $this->assertEquals($startTimeMillis, $subscriptionResponse->getStartTimeMillis());
-        $this->assertEquals($expiryTimeMillis, $subscriptionResponse->getExpiresDate());
-        $this->assertEquals($subscriptionPurchaseMock, $subscriptionResponse->getRawResponse());
+        $this->assertEquals($expiryTimeMillis, $subscriptionResponse->getExpiryTimeMillis());
+        $this->assertEquals($userCancellationTimeMillis, $subscriptionResponse->getUserCancellationTimeMillis());
+        $this->assertEquals($developerPayload, $subscriptionResponse->getDeveloperPayload());
+        $this->assertEquals($paymentState, $subscriptionResponse->getPaymentState());
     }
 }