diff --git a/Classes/Api/PaymentApi.php b/Classes/Api/PaymentApi.php
index 0e4e591..6011f38 100644
--- a/Classes/Api/PaymentApi.php
+++ b/Classes/Api/PaymentApi.php
@@ -54,7 +54,7 @@ static public function getTransactorConf ($gatewayExtensionKey, $key = '')
         $transactorConf = [];
         $result = '';
 
-        $transactorConf = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
+        $transactorConf = GeneralUtility::makeInstance(
             \TYPO3\CMS\Core\Configuration\ExtensionConfiguration::class
         )->get($gatewayExtensionKey);
 
@@ -84,7 +84,7 @@ static public function getConf (
     )
     {
         $result = [];
-        $result = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
+        $result = GeneralUtility::makeInstance(
             \TYPO3\CMS\Core\Configuration\ExtensionConfiguration::class
         )->get('transactor');
 
@@ -92,7 +92,7 @@ static public function getConf (
             $extensionKey != '' &&
             isset($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'][$extensionKey])
         ) {
-            $extManagerConf = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
+            $extManagerConf = GeneralUtility::makeInstance(
                 \TYPO3\CMS\Core\Configuration\ExtensionConfiguration::class
             )->get($extensionKey);
         }
diff --git a/Classes/Domain/GatewayProxy.php b/Classes/Domain/GatewayProxy.php
index aad4acf..e9238c4 100644
--- a/Classes/Domain/GatewayProxy.php
+++ b/Classes/Domain/GatewayProxy.php
@@ -26,8 +26,8 @@
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/
 
-use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;
 
 use JambageCom\Transactor\Domain\Gateway;
@@ -61,11 +61,11 @@ class GatewayProxy implements \JambageCom\Transactor\Domain\GatewayInterface
     public function init ($extensionKey)
     {
         $this->gatewayClass = '';
-        $this->extensionManagerConf = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
+        $this->extensionManagerConf = GeneralUtility::makeInstance(
             \TYPO3\CMS\Core\Configuration\ExtensionConfiguration::class
         )->get('transactor');
 
-        $newExtensionManagerConf = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
+        $newExtensionManagerConf = GeneralUtility::makeInstance(
             \TYPO3\CMS\Core\Configuration\ExtensionConfiguration::class
         )->get($extensionKey);
 
diff --git a/Classes/Request/Parameters.php b/Classes/Request/Parameters.php
index 463d4cc..b88430b 100644
--- a/Classes/Request/Parameters.php
+++ b/Classes/Request/Parameters.php
@@ -35,6 +35,7 @@
 *
 */
 
+use TYPO3\CMS\Core\Utility\ArrayUtility;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 
 
@@ -90,10 +91,13 @@ static public function getPiVars ()
             self::$prefixId &&
             !isset(self::$piVars[self::$prefixId])
         ) {
-            self::$piVars = GeneralUtility::_GPmerged(self::$prefixId);
+            self::$piVars = $GLOBALS['TYPO3_REQUEST']->getQueryParams()[self::$prefixId];
+            ArrayUtility::mergeRecursiveWithOverrule(
+                self::$piVars,
+                $GLOBALS['TYPO3_REQUEST']->getParsedBody()[self::$prefixId]
+            );
         }
         $result = self::$piVars;
         return $result;
     }
 }
-
diff --git a/ext_emconf.php b/ext_emconf.php
index fec8fc2..483d297 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -8,7 +8,7 @@
     'title' => 'Payment Transactor API',
     'description' => 'This is a basic API to develop extensions which connect to different payment transaction gateways.',
     'category' => 'misc',
-    'version' => '0.11.0',
+    'version' => '0.11.1',
     'state' => 'stable',
     'clearcacheonload' => 0,
     'author' => 'Franz Holzinger',