diff --git a/phpunit.xml b/phpunit.xml
index 3738b96..8aec30d 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -15,6 +15,14 @@
         </testsuite>
     </testsuites>
 
+    <groups>
+        <exclude>
+            <group>
+                integration
+            </group>
+        </exclude>
+    </groups>
+
     <logging>
         <log type="junit" target="build/junit.xml" logIncompleteSkipped="false" />
         <log type="coverage-html" target="build/coverage/" charset="UTF-8"
diff --git a/tests/PayPal/Test/Api/AddressTest.php b/tests/PayPal/Test/Api/AddressTest.php
index b02dd07..b881b30 100644
--- a/tests/PayPal/Test/Api/AddressTest.php
+++ b/tests/PayPal/Test/Api/AddressTest.php
@@ -42,7 +42,7 @@ class AddressTest extends \PHPUnit_Framework_TestCase {
 		$this->assertEquals(self::$countryCode, $this->address->getCountryCode());
 		$this->assertEquals(self::$phone, $this->address->getPhone());
 	}
-	
+
 	public function testSerializeDeserialize() {
 		$a1 = $this->address;
 		
diff --git a/tests/PayPal/Test/Api/AuthorizationTest.php b/tests/PayPal/Test/Api/AuthorizationTest.php
index 3f3ea9b..a575044 100644
--- a/tests/PayPal/Test/Api/AuthorizationTest.php
+++ b/tests/PayPal/Test/Api/AuthorizationTest.php
@@ -122,6 +122,10 @@ class AuthorizationTest extends \PHPUnit_Framework_TestCase {
 		$a2->fromJson($a1->toJson());
 		$this->assertEquals($a1, $a2);
 	}
+
+    /**
+     * @group integration
+     */
 	public function testOperations() {
         try {
             $authId = self::authorize();
@@ -150,13 +154,16 @@ class AuthorizationTest extends \PHPUnit_Framework_TestCase {
             } catch (\InvalidArgumentException $ex) {
                 $this->assertEquals($ex->getMessage(), "Id cannot be null");
             }
-        } catch (\PayPal\Exception\PPConnectionException $ex) {
+        } catch (PPConnectionException $ex) {
             $this->markTestSkipped(
                 'Tests failing because of intermittent failures in Paypal Sandbox environment.' . $ex->getMessage()
             );
         }
 	}
-	
+
+    /**
+     * @group integration
+     */
 	public function testReauthorize() {
 		$authorization = Authorization::get('7GH53639GA425732B');
 	
diff --git a/tests/PayPal/Test/Api/CaptureTest.php b/tests/PayPal/Test/Api/CaptureTest.php
index a1162fd..7991e44 100644
--- a/tests/PayPal/Test/Api/CaptureTest.php
+++ b/tests/PayPal/Test/Api/CaptureTest.php
@@ -55,33 +55,42 @@ class CaptureTest extends \PHPUnit_Framework_TestCase {
 		
 		$this->assertEquals($c1, $c2);
 	}
-	
+
+    /**
+     * @group integration
+     */
 	public function testOperations()
 	{
-		$authId = AuthorizationTest::authorize();
-		$auth = Authorization::get($authId);
-		
-		$amount = new Amount();
-		$amount->setCurrency("USD");
-		$amount->setTotal("1.00");
-		
-		$captr = new Capture();
-		$captr->setId($authId);
-		$captr->setAmount($amount);
-		
-		$capt = $auth->capture($captr);
-		$captureId = $capt->getId();
-		$this->assertNotNull($captureId);
-		
-		$refund = new Refund();
-		$refund->setId($captureId);
-		$refund->setAmount($amount);
-		
-		$capture = Capture::get($captureId);
-		$this->assertNotNull($capture->getId());
-		
-		$retund = $capture->refund($refund);
-		$this->assertNotNull($retund->getId());
+        try {
+            $authId = AuthorizationTest::authorize();
+            $auth = Authorization::get($authId);
+
+            $amount = new Amount();
+            $amount->setCurrency("USD");
+            $amount->setTotal("1.00");
+
+            $captr = new Capture();
+            $captr->setId($authId);
+            $captr->setAmount($amount);
+
+            $capt = $auth->capture($captr);
+            $captureId = $capt->getId();
+            $this->assertNotNull($captureId);
+
+            $refund = new Refund();
+            $refund->setId($captureId);
+            $refund->setAmount($amount);
+
+            $capture = Capture::get($captureId);
+            $this->assertNotNull($capture->getId());
+
+            $retund = $capture->refund($refund);
+            $this->assertNotNull($retund->getId());
+        } catch (PPConnectionException $ex) {
+            $this->markTestSkipped(
+                'Tests failing because of intermittent failures in Paypal Sandbox environment.' . $ex->getMessage()
+            );
+        }
 		
 	}
 }
\ No newline at end of file
diff --git a/tests/PayPal/Test/Api/CreditCardTest.php b/tests/PayPal/Test/Api/CreditCardTest.php
index 84cb96b..fd0bb03 100644
--- a/tests/PayPal/Test/Api/CreditCardTest.php
+++ b/tests/PayPal/Test/Api/CreditCardTest.php
@@ -71,6 +71,9 @@ class CreditCardTest extends \PHPUnit_Framework_TestCase {
 		$this->assertEquals($c1, $c2);
 	}
 
+    /**
+     * @group integration
+     */
 	public function testOperations() {
 		$c1 = $this->cards['full'];
 
diff --git a/tests/PayPal/Test/Api/PaymentTest.php b/tests/PayPal/Test/Api/PaymentTest.php
index 6e92d23..fd0ce9d 100644
--- a/tests/PayPal/Test/Api/PaymentTest.php
+++ b/tests/PayPal/Test/Api/PaymentTest.php
@@ -66,6 +66,9 @@ class PaymentTest extends \PHPUnit_Framework_TestCase {
 		$this->assertEquals($p2, $this->payments['full']);
 	}
 
+    /**
+     * @group integration
+     */
 	public function testOperations() {
 
 		$p1 = $this->payments['new'];
diff --git a/tests/PayPal/Test/Api/SaleTest.php b/tests/PayPal/Test/Api/SaleTest.php
index b4c6972..1794725 100644
--- a/tests/PayPal/Test/Api/SaleTest.php
+++ b/tests/PayPal/Test/Api/SaleTest.php
@@ -7,6 +7,7 @@ use PayPal\Test\Constants;
 use PayPal\Test\Api\AmountTest;
 use PayPal\Test\Api\PaymentTest;
 use PayPal\Test\Api\LinksTest;
+use PayPal\Exception\PPConnectionException;
 
 class SaleTest extends \PHPUnit_Framework_TestCase {
 
@@ -51,23 +52,32 @@ class SaleTest extends \PHPUnit_Framework_TestCase {
 		
 		$this->assertEquals($s1, $s2);
 	}
-	
+
+    /**
+     * @group integration
+     */
 	public function testOperations() {
-		$payment = PaymentTest::createNewPayment();			
-		$payment->create();
-		
-		$transactions = $payment->getTransactions();
-		$resources = $transactions[0]->getRelatedResources();		
-		$saleId = $resources[0]->getSale()->getId();
-		
-		$sale = Sale::get($saleId);
-		$this->assertNotNull($sale);		
-		
-		$refund = new Refund();
-		$refund->setAmount(AmountTest::createAmount());
-		$sale->refund($refund);
-		
-		$this->setExpectedException('\InvalidArgumentException');
-		$sale->refund(NULL);
+        try {
+            $payment = PaymentTest::createNewPayment();
+            $payment->create();
+
+            $transactions = $payment->getTransactions();
+            $resources = $transactions[0]->getRelatedResources();
+            $saleId = $resources[0]->getSale()->getId();
+
+            $sale = Sale::get($saleId);
+            $this->assertNotNull($sale);
+
+            $refund = new Refund();
+            $refund->setAmount(AmountTest::createAmount());
+            $sale->refund($refund);
+
+            $this->setExpectedException('\InvalidArgumentException');
+            $sale->refund(NULL);
+        } catch (PPConnectionException $ex) {
+            $this->markTestSkipped(
+                'Tests failing because of intermittent failures in Paypal Sandbox environment.' . $ex->getMessage()
+            );
+        }
 	}
 }
\ No newline at end of file