diff --git a/bitpay/bp_lib.php b/bitpay/bp_lib.php
index 040c746..6eacd5c 100755
--- a/bitpay/bp_lib.php
+++ b/bitpay/bp_lib.php
@@ -1,19 +1,19 @@
 <?php
 /**
  * The MIT License (MIT)
- * 
+ *
  * Copyright (c) 2011-2015 BitPay
- * 
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
- * 
+ *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
@@ -26,17 +26,17 @@
 require_once 'bp_options.php';
 
 function bpCurl($url, $apiKey, $post = false) {
-	global $bpOptions;	
-		
+	global $bpOptions;
+
 	$curl = curl_init($url);
 	$length = 0;
 	if ($post)
-	{	
+	{
 		curl_setopt($curl, CURLOPT_POST, 1);
 		curl_setopt($curl, CURLOPT_POSTFIELDS, $post);
 		$length = strlen($post);
 	}
-	
+
 	$uname = base64_encode($apiKey);
 	$header = array(
 		'Content-Type: application/json',
@@ -54,9 +54,9 @@ function bpCurl($url, $apiKey, $post = false) {
 	curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 	curl_setopt($curl, CURLOPT_FORBID_REUSE, 1);
 	curl_setopt($curl, CURLOPT_FRESH_CONNECT, 1);
-		
+
 	$responseString = curl_exec($curl);
-	
+
 	if($responseString == false) {
 		$response = curl_error($curl);
 	} else {
@@ -65,43 +65,43 @@ function bpCurl($url, $apiKey, $post = false) {
 	curl_close($curl);
 	return $response;
 }
-// $orderId: Used to display an orderID to the buyer. In the account summary view, this value is used to 
+// $orderId: Used to display an orderID to the buyer. In the account summary view, this value is used to
 // identify a ledger entry if present.
 //
-// $price: by default, $price is expressed in the currency you set in bp_options.php.  The currency can be 
+// $price: by default, $price is expressed in the currency you set in bp_options.php.  The currency can be
 // changed in $options.
 //
 // $posData: this field is included in status updates or requests to get an invoice.  It is intended to be used by
 // the merchant to uniquely identify an order associated with an invoice in their system.  Aside from that, Bit-Pay does
 // not use the data in this field.  The data in this field can be anything that is meaningful to the merchant.
 //
-// $options keys can include any of: 
+// $options keys can include any of:
 // ('itemDesc', 'itemCode', 'notificationEmail', 'notificationURL', 'redirectURL', 'apiKey'
-//		'currency', 'physical', 'fullNotifications', 'transactionSpeed', 'buyerName', 
+//		'currency', 'physical', 'fullNotifications', 'transactionSpeed', 'buyerName',
 //		'buyerAddress1', 'buyerAddress2', 'buyerCity', 'buyerState', 'buyerZip', 'buyerEmail', 'buyerPhone')
 // If a given option is not provided here, the value of that option will default to what is found in bp_options.php
 // (see api documentation for information on these options).
-function bpCreateInvoice($orderId, $price, $posData, $options = array()) {	
-	global $bpOptions;	
-	
+function bpCreateInvoice($orderId, $price, $posData, $options = array()) {
+	global $bpOptions;
+
 	$options = array_merge($bpOptions, $options);	// $options override any options found in bp_options.php
-	
+
 	$options['posData'] = '{"posData": "' . $posData . '"';
 	if ($bpOptions['verifyPos']) // if desired, a hash of the POS data is included to verify source in the callback
 		$options['posData'].= ', "hash": "' . crypt($posData, $options['apiKey']).'"';
-	$options['posData'].= '}';	
-	
+	$options['posData'].= '}';
+
 	$options['orderID'] = $orderId;
 	$options['price'] = $price;
-	
-	$postOptions = array('orderID', 'itemDesc', 'itemCode', 'notificationEmail', 'notificationURL', 'redirectURL', 
-		'posData', 'price', 'currency', 'physical', 'fullNotifications', 'transactionSpeed', 'buyerName', 
+
+	$postOptions = array('orderID', 'itemDesc', 'itemCode', 'notificationEmail', 'notificationURL', 'redirectURL',
+		'posData', 'price', 'currency', 'physical', 'fullNotifications', 'transactionSpeed', 'buyerName',
 		'buyerAddress1', 'buyerAddress2', 'buyerCity', 'buyerState', 'buyerZip', 'buyerEmail', 'buyerPhone');
 	foreach($postOptions as $o)
 		if (array_key_exists($o, $options))
 			$post[$o] = $options[$o];
 	$post = json_encode($post);
-	
+
 	$response = bpCurl('https://bitpay.com/api/invoice/', $options['apiKey'], $post);
 
 	return $response;
@@ -111,25 +111,25 @@ function bpCreateInvoice($orderId, $price, $posData, $options = array()) {
 function bpVerifyNotification($apiKey = false) {
 	global $bpOptions;
 	if (!$apiKey)
-		$apiKey = $bpOptions['apiKey'];		
-	
+		$apiKey = $bpOptions['apiKey'];
+
 	$post = file_get_contents("php://input");
 	if (!$post)
 		return 'No post data';
-		
+
 	$json = json_decode($post, true);
-	
+
 	if (is_string($json))
 		return $json; // error
 
-	if (!array_key_exists('posData', $json)) 
+	if (!array_key_exists('posData', $json))
 		return 'no posData';
-		
+
 	$posData = json_decode($json['posData'], true);
-	if($bpOptions['verifyPos'] and $posData['hash'] != crypt($posData['posData'], $apiKey)) 
+	if($bpOptions['verifyPos'] and $posData['hash'] != crypt($posData['posData'], $apiKey))
 		return 'authentication failed (bad hash)';
 	$json['posData'] = $posData['posData'];
-		
+
 	if (!array_key_exists('id', $json))
         {
             return 'Cannot find invoice ID';
@@ -142,17 +142,13 @@ function bpVerifyNotification($apiKey = false) {
 function bpGetInvoice($invoiceId, $apiKey=false) {
 	global $bpOptions;
 	if (!$apiKey)
-		$apiKey = $bpOptions['apiKey'];		
+		$apiKey = $bpOptions['apiKey'];
 
 	$response = bpCurl('https://bitpay.com/api/invoice/'.$invoiceId, $apiKey);
 	if (is_string($response))
 		return $response; // error
 	$response['posData'] = json_decode($response['posData'], true);
-	if($bpOptions['verifyPos'])
-        {
-            $response['posData'] = $response['posData']['posData'];
-        }
-	return $response;	
+	return $response;
 }
 
 ?>
diff --git a/bitpay_callback.php b/bitpay_callback.php
index d50e825..a4aec32 100755
--- a/bitpay_callback.php
+++ b/bitpay_callback.php
@@ -2,19 +2,19 @@
 
 /**
  * The MIT License (MIT)
- * 
+ *
  * Copyright (c) 2011-2015 BitPay
- * 
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
- * 
+ *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
@@ -23,7 +23,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
- 
+
 require 'bitpay/bp_lib.php';
 require 'includes/application_top.php';
 
@@ -37,18 +37,30 @@ function bplog($contents) {
     }
 }
 
+function validateResponse($response, $keys) {
+    if (is_array($response) &&
+        array_key_exists($keys[0], $response) &&
+        array_key_exists($keys[0], $response[$keys[0]]) &&
+        preg_match('/^\d+$/', $response[$keys[0]][$keys[0]]) &&
+        array_key_exists($keys[1], $response)) {
+        return true;
+    }
+    return false;
+}
+
 $response = bpVerifyNotification(MODULE_PAYMENT_BITPAY_APIKEY);
+$keys = array('posData', 'status');
 
-if (true === is_string($response)) {
+if (!validateResponse($response, $keys)) {
     bplog(date('H:i') . " bitpay callback error: " . $response . "\n");
 } else {
     global $db;
-    $order_id = $response['posData'];
-
-    switch ($response['status']) {
-        case 'confirmed':    
+    $order_id = $response[$keys[0]][$keys[0]];
+    $status = $response[$keys[1]];
+    switch ($status) {
+        case 'confirmed':
         case 'complete':
-            $db->Execute("update ". TABLE_ORDERS. " set orders_status = " . MODULE_PAYMENT_BITPAY_PAID_STATUS_ID . " where orders_id = ". intval($order_id));      
+            $db->Execute("update ". TABLE_ORDERS. " set orders_status = " . MODULE_PAYMENT_BITPAY_PAID_STATUS_ID . " where orders_id = ". intval($order_id));
             break;
         case 'expired':
             if (true === function_exists('zen_remove_order')) {