diff --git a/README.md b/README.md
index b40e37e..6100692 100644
--- a/README.md
+++ b/README.md
@@ -65,7 +65,7 @@ repository.
             return "Pending, Reference: ". $response->getTransactionReference();
         } else {
             // payment failed: display message to customer
-            return "Error " .$response->getCode() . ': ' . $response->getMessage();
+            return "Error " .$response->getError();
         }
     } else {
         /**
@@ -74,10 +74,9 @@ repository.
         // Check the status
         $response = $gateway->completePurchase()->send();
         if ($response->isSuccessful()) {
-            $reference = $response->getTransactionReference();  // TODO; Check the reference/id with your database
-            return "Transaction '" . $response->getTransactionId() . "' succeeded!";
+            $transaction = $response->getTransaction();
         } else {
-            return "Error " .$response->getCode() . ': ' . $response->getMessage();
+            return "Error " .$response->getError();
         }
     }
 ```
diff --git a/src/Message/AbstractResponse.php b/src/Message/AbstractResponse.php
index 307f88e..4b1bc97 100644
--- a/src/Message/AbstractResponse.php
+++ b/src/Message/AbstractResponse.php
@@ -16,4 +16,9 @@ abstract class AbstractResponse extends BaseAbstractResponse
             $this->error = (string) $this->data->error;
         }
     }
+
+    public function getError()
+    {
+        return $this->error;
+    }
 }
diff --git a/src/Message/CompletePurchaseRequest.php b/src/Message/CompletePurchaseRequest.php
index a36c223..9f91724 100644
--- a/src/Message/CompletePurchaseRequest.php
+++ b/src/Message/CompletePurchaseRequest.php
@@ -9,7 +9,7 @@ class CompletePurchaseRequest extends AbstractRequest
     protected function generateSignature()
     {
         return sha1(
-            $this->getTransactionReference() . $this->getClientId() . $this->getClientSecret()
+            $this->getTransactionReference() . $this->getClientSecret()
         );
     }
 
@@ -20,14 +20,13 @@ class CompletePurchaseRequest extends AbstractRequest
 
     public function getData()
     {
-        $this->validate('merchantId', 'merchantKey');
-
         $data = array(
             "clientId" => $this->getClientId(),
-            "clientSecret" => $this->getClientSecret(),
             "transactionId" => $this->getTransactionReference(),
             "sha1" => $this->generateSignature()
         );
+
+        return $data;
     }
 
     public function sendData($data)
diff --git a/src/Message/CompletePurchaseResponse.php b/src/Message/CompletePurchaseResponse.php
index 309f2f9..c7b4164 100644
--- a/src/Message/CompletePurchaseResponse.php
+++ b/src/Message/CompletePurchaseResponse.php
@@ -14,8 +14,8 @@ class CompletePurchaseResponse extends PurchaseResponse
         return false;
     }
 
-    public function getStatus()
+    public function getTransaction()
     {
-        return $this->data->transaction->status;
+        return $this->data->transaction;
     }
 }
diff --git a/src/Message/PurchaseRequest.php b/src/Message/PurchaseRequest.php
index 7c07228..a3391a6 100644
--- a/src/Message/PurchaseRequest.php
+++ b/src/Message/PurchaseRequest.php
@@ -9,7 +9,7 @@ class PurchaseRequest extends AbstractRequest
     protected function generateSignature()
     {
         return sha1(
-            $this->getTransactionId() . $this->getAmountInteger() . $this->getClientId() . $this->getClientSecret()
+            $this->getTransactionId() . $this->getAmountInteger() . $this->getClientSecret()
         );
     }
 
@@ -23,13 +23,14 @@ class PurchaseRequest extends AbstractRequest
 
         $data = array(
             "clientId" => $this->getClientId(),
-            "clientSecret" => $this->getClientSecret(),
             "transactionId" => $this->getTransactionId(),
             "amount" => $this->getAmountInteger(),
             "description" => $this->getDescription(),
             "returnUrl" => $this->getReturnUrl(),
             "sha1" => $this->generateSignature()
         );
+
+        return $data;
     }
 
     public function sendData($data)
diff --git a/src/Message/PurchaseResponse.php b/src/Message/PurchaseResponse.php
index b2e72e0..e40255c 100644
--- a/src/Message/PurchaseResponse.php
+++ b/src/Message/PurchaseResponse.php
@@ -13,7 +13,7 @@ class PurchaseResponse extends AbstractResponse implements RedirectResponseInter
 
     public function isRedirect()
     {
-        return is_null($this->error);
+        return is_null($this->getError());
     }
 
     public function isPending()