diff --git a/src/Message/AIMAbstractRequest.php b/src/Message/AIMAbstractRequest.php
index 8133b928..9a5bb5ae 100644
--- a/src/Message/AIMAbstractRequest.php
+++ b/src/Message/AIMAbstractRequest.php
@@ -276,8 +276,8 @@ protected function addReferenceId(\SimpleXMLElement $data)
 
     protected function addTransactionType(\SimpleXMLElement $data)
     {
-        if (!$this->action) {
-            // The extending class probably hasn't specified an "action"
+        if (! $this->action) {
+            // The extending class probably hasn't specified an "action".
             throw new InvalidRequestException();
         }
 
diff --git a/src/Message/Query/AIMAbstractQueryRequest.php b/src/Message/Query/AIMAbstractQueryRequest.php
index 9f719070..e3ca2433 100644
--- a/src/Message/Query/AIMAbstractQueryRequest.php
+++ b/src/Message/Query/AIMAbstractQueryRequest.php
@@ -2,16 +2,26 @@
 
 namespace Omnipay\AuthorizeNet\Message\Query;
 
-use Omnipay\AuthorizeNet\Message\AIMAbstractRequest;
-
 /**
  * Authorize.Net AIM Abstract Request
  */
+
+use Omnipay\AuthorizeNet\Message\AIMAbstractRequest;
+use SimpleXMLElement;
+
 abstract class AIMAbstractQueryRequest extends AIMAbstractRequest
 {
     protected $limit = 1000;
     protected $offset = 1;
 
+    /**
+     * Disable validation check on the parent method.
+     */
+    protected function addTransactionType(SimpleXMLElement $data)
+    {
+        // NOOP
+    }
+
     /**
      * Get Limit.
      *
diff --git a/src/Message/Query/QueryBatchRequest.php b/src/Message/Query/QueryBatchRequest.php
index a15b64ae..d2a7e630 100644
--- a/src/Message/Query/QueryBatchRequest.php
+++ b/src/Message/Query/QueryBatchRequest.php
@@ -5,17 +5,26 @@
 /**
  * Authorize.Net AIM Authorize Request
  */
+
 class QueryBatchRequest extends AIMAbstractQueryRequest
 {
-    protected $action = '';
     protected $requestType = 'getSettledBatchListRequest';
 
     public function sendData($data)
     {
         $headers = array('Content-Type' => 'text/xml; charset=utf-8');
         $data = $data->saveXml();
-        $httpResponse = $this->httpClient->request('POST', $this->getEndpoint(), $headers, $data);
 
-        return $this->response = new QueryBatchResponse($this, $httpResponse->getBody()->getContents());
+        $httpResponse = $this->httpClient->request(
+            'POST',
+            $this->getEndpoint(),
+            $headers,
+            $data
+        );
+
+        return $this->response = new QueryBatchResponse(
+            $this,
+            $httpResponse->getBody()->getContents()
+        );
     }
 }
diff --git a/src/Message/Query/QueryRequest.php b/src/Message/Query/QueryRequest.php
index e0429563..1fe967bb 100644
--- a/src/Message/Query/QueryRequest.php
+++ b/src/Message/Query/QueryRequest.php
@@ -5,13 +5,16 @@
 /**
  * Authorize.Net AIM Authorize Request
  */
+
 class QueryRequest extends QueryBatchRequest
 {
+    const DATE_TIME_FORMAT = 'Y-m-d\Th:i:s\Z';
+
     protected $startTimestamp;
     protected $endTimestamp;
 
     /**
-     * @return mixed
+     * @return int|null
      */
     public function getStartTimestamp()
     {
@@ -19,7 +22,7 @@ public function getStartTimestamp()
     }
 
     /**
-     * @param mixed $startTimestamp
+     * @param int|null $startTimestamp unix timestamp
      */
     public function setStartTimestamp($startTimestamp)
     {
@@ -27,7 +30,7 @@ public function setStartTimestamp($startTimestamp)
     }
 
     /**
-     * @return mixed
+     * @return int|null
      */
     public function getEndTimestamp()
     {
@@ -35,7 +38,7 @@ public function getEndTimestamp()
     }
 
     /**
-     * @param mixed $endTimestamp
+     * @param int|null $endTimestamp unix timestamp
      */
     public function setEndTimestamp($endTimestamp)
     {
@@ -48,13 +51,22 @@ public function setEndTimestamp($endTimestamp)
     public function getData()
     {
         $data = $this->getBaseData();
+
         if ($this->getStartTimestamp()) {
-            $data->firstSettlementDate = date('Y-m-d\Th:i:s\Z', $this->getStartTimestamp());
-            $data->lastSettlementDate = date('Y-m-d\Th:i:s\Z');
+            $data->firstSettlementDate = date(
+                static::DATE_TIME_FORMAT,
+                $this->getStartTimestamp()
+            );
+            $data->lastSettlementDate = date(static::DATE_TIME_FORMAT);
         }
+
         if ($this->getEndTimestamp()) {
-            $data->lastSettlementDate = date('Y-m-d\Th:i:s\Z', $this->getEndTimestamp());
+            $data->lastSettlementDate = date(
+                static::DATE_TIME_FORMAT,
+                $this->getEndTimestamp()
+            );
         }
+
         return $data;
     }
 
@@ -62,9 +74,19 @@ public function sendData($data)
     {
         $headers = array('Content-Type' => 'text/xml; charset=utf-8');
         $data = $data->saveXml();
-        $httpResponse = $this->httpClient->request('POST', $this->getEndpoint(), $headers, $data);
 
-        $this->response = new QueryResponse($this, $httpResponse->getBody()->getContents());
+        $httpResponse = $this->httpClient->request(
+            'POST',
+            $this->getEndpoint(),
+            $headers,
+            $data
+        );
+
+        $this->response = new QueryResponse(
+            $this,
+            $httpResponse->getBody()->getContents()
+        );
+
         return $this->response;
     }
 }