diff --git a/.gitignore b/.gitignore
index 9c6d3c32..bfdce806 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,4 +11,7 @@ Thumbs.db
 nbproject/
 
 # Transifex
-.tx/
\ No newline at end of file
+.tx/
+
+# Composer
+vendor/
diff --git a/bin/queue b/bin/queue
index 8daf0492..e1396f49 100755
--- a/bin/queue
+++ b/bin/queue
@@ -12,7 +12,16 @@
  */
 
 define('TL_MODE', 'FE');
-require __DIR__ . '/../../../initialize.php';
+
+if (file_exists(__DIR__ . '/../../../initialize.php')) {
+    // Regular way
+    require_once(__DIR__ . '/../../../initialize.php');
+} else {
+    // Try composer location (see #77)
+    require_once(__DIR__ . '/../../../../../system/initialize.php');
+}
+
+
 $queueManager = $GLOBALS['NOTIFICATION_CENTER']['QUEUE_MANAGER'];
 
 $queueManager->sendFromQueue($argv[2], $argv[4]);
diff --git a/classes/tl_form.php b/classes/tl_form.php
index 1fdec747..c34ca78d 100644
--- a/classes/tl_form.php
+++ b/classes/tl_form.php
@@ -79,12 +79,12 @@ public function generateTokens(array $arrData, array $arrForm, array $arrFiles,
         $arrTokens['raw_data'] = '';
 
         foreach ($arrData as $k => $v) {
-            $this->flatten($v, 'form_'.$k, $arrTokens);
+            \Haste\Util\StringUtil::flatten($v, 'form_'.$k, $arrTokens);
             $arrTokens['raw_data'] .= (isset($arrLabels[$k]) ? $arrLabels[$k] : ucfirst($k)) . ': ' . (is_array($v) ? implode(', ', $v) : $v) . "\n";
         }
 
         foreach ($arrForm as $k => $v) {
-            $this->flatten($v, 'formconfig_'.$k, $arrTokens);
+            \Haste\Util\StringUtil::flatten($v, 'formconfig_'.$k, $arrTokens);
         }
 
         // Administrator e-mail
@@ -104,6 +104,9 @@ public function generateTokens(array $arrData, array $arrForm, array $arrFiles,
      * @param mixed  $varValue
      * @param string $strKey
      * @param array  $arrData
+     *
+     * @deprecated Deprecated since version 1.3.1, to be removed in version 2.
+     *             Use Haste\Util\StringUtil::flatten() instead.
      */
     public function flatten($varValue, $strKey, &$arrData)
     {
diff --git a/classes/tl_nc_language.php b/classes/tl_nc_language.php
index ef744ba6..09554187 100644
--- a/classes/tl_nc_language.php
+++ b/classes/tl_nc_language.php
@@ -155,7 +155,7 @@ public function validateEmailList($varValue, \DataContainer $dc)
             foreach ($chunks as $chunk) {
 
                 // Skip string with tokens or inserttags
-                if (strpos($chunk, '##') !== false || strpos($chunk, '{{') !== false) {
+                if (strpos($chunk, '##') !== false || strpos($chunk, '{{') !== false|| strpos($chunk, '{if') !== false) {
                     continue;
                 }
 
diff --git a/composer.json b/composer.json
index cca7bca0..e8c105f0 100644
--- a/composer.json
+++ b/composer.json
@@ -14,16 +14,18 @@
         "php":">=5.3.2",
         "contao/core":"^3.2",
         "contao-community-alliance/composer-plugin":"2.*",
-        "terminal42/contao-namespace-class-loader":"^1.0.1",
-        "codefog/contao-haste":"4.*",
+        "codefog/contao-haste":"^4.10.0",
         "terminal42/dcawizard":"2.*"
     },
     "autoload":{
         "psr-0": {
             "NotificationCenter\\": [
-                "/library"
+                "library/"
             ]
-        }
+        },
+        "classmap": [
+            "classes/"
+        ]
     },
     "replace": {
         "contao-legacy/notification_center": "self.version"
diff --git a/config/autoload.php b/config/autoload.php
index ad16b5c2..0a021719 100644
--- a/config/autoload.php
+++ b/config/autoload.php
@@ -11,24 +11,28 @@
 /**
  * Register PSR-0 namespace
  */
-NamespaceClassLoader::add('NotificationCenter', 'system/modules/notification_center/library');
+if (class_exists('NamespaceClassLoader')) {
+    NamespaceClassLoader::add('NotificationCenter', 'system/modules/notification_center/library');
+}
 
 
 /**
  * Register classes outside the namespace folder
  */
-NamespaceClassLoader::addClassMap(array
-(
-    // DCA Helpers
-    'NotificationCenter\tl_form'                => 'system/modules/notification_center/classes/tl_form.php',
-    'NotificationCenter\tl_member'              => 'system/modules/notification_center/classes/tl_member.php',
-    'NotificationCenter\tl_module'              => 'system/modules/notification_center/classes/tl_module.php',
-    'NotificationCenter\tl_nc_gateway'          => 'system/modules/notification_center/classes/tl_nc_gateway.php',
-    'NotificationCenter\tl_nc_notification'     => 'system/modules/notification_center/classes/tl_nc_notification.php',
-    'NotificationCenter\tl_nc_language'         => 'system/modules/notification_center/classes/tl_nc_language.php',
-    'NotificationCenter\tl_nc_message'          => 'system/modules/notification_center/classes/tl_nc_message.php',
-    'NotificationCenter\tl_nc_queue'            => 'system/modules/notification_center/classes/tl_nc_queue.php'
-));
+if (class_exists('NamespaceClassLoader')) {
+    NamespaceClassLoader::addClassMap(array
+    (
+        // DCA Helpers
+        'NotificationCenter\tl_form'                => 'system/modules/notification_center/classes/tl_form.php',
+        'NotificationCenter\tl_member'              => 'system/modules/notification_center/classes/tl_member.php',
+        'NotificationCenter\tl_module'              => 'system/modules/notification_center/classes/tl_module.php',
+        'NotificationCenter\tl_nc_gateway'          => 'system/modules/notification_center/classes/tl_nc_gateway.php',
+        'NotificationCenter\tl_nc_notification'     => 'system/modules/notification_center/classes/tl_nc_notification.php',
+        'NotificationCenter\tl_nc_language'         => 'system/modules/notification_center/classes/tl_nc_language.php',
+        'NotificationCenter\tl_nc_message'          => 'system/modules/notification_center/classes/tl_nc_message.php',
+        'NotificationCenter\tl_nc_queue'            => 'system/modules/notification_center/classes/tl_nc_queue.php'
+    ));
+}
 
 
 /**
diff --git a/languages/en/tl_nc_gateway.php b/languages/en/tl_nc_gateway.php
index f3cd2934..dd0aceaa 100644
--- a/languages/en/tl_nc_gateway.php
+++ b/languages/en/tl_nc_gateway.php
@@ -83,4 +83,10 @@
 <br><blockquote>5 * * * * /path/to/contao/system/modules/notification_center/bin/queue -s {gateway_id} -n 30</blockquote><br>
 If you don\'t have access to real cronjobs then you can enable the poor man\'s cron. Note that it doesn\'t provide the same
 flexibility in terms of interval settings and it is subject to the web execution context and thus certainly affected by
-PHP configurations such as the maximum execution time. Thus, try to keep the number of messages sent per invocation as low as possible.';
+PHP configurations such as the maximum execution time. Thus, try to keep the number of messages sent per invocation as low as possible.
+<br><br>
+<strong>Note: </strong>When you installed the notification center using Composer, the path to the binary differs:
+<blockquote>
+/path/to/contao/composer/vendor/terminal42/notification_center/bin/queue
+</blockquote>
+';
diff --git a/library/NotificationCenter/Gateway/Base.php b/library/NotificationCenter/Gateway/Base.php
index 49d450cb..8064eba9 100644
--- a/library/NotificationCenter/Gateway/Base.php
+++ b/library/NotificationCenter/Gateway/Base.php
@@ -68,18 +68,18 @@ protected function compileRecipients($strRecipients, $arrTokens)
     }
 
     /**
-     * @deprecated Use String::recursiveReplaceTokensAndTags()
+     * @deprecated Use \Haste\Util\StringUtil::recursiveReplaceTokensAndTags()
      */
     protected function recursiveReplaceTokensAndTags($strText, $arrTokens, $intTextFlags = 0)
     {
-        return String::recursiveReplaceTokensAndTags($strText, $arrTokens, $intTextFlags);
+        return \Haste\Util\StringUtil::recursiveReplaceTokensAndTags($strText, $arrTokens, $intTextFlags);
     }
 
     /**
-     * @deprecated Use String::convertToText()
+     * @deprecated Use \Haste\Util\StringUtil::convertToText()
      */
     protected function convertToText($varValue, $options)
     {
-        return String::convertToText($varValue, $options);
+        return \Haste\Util\StringUtil::convertToText($varValue, $options);
     }
 }
diff --git a/library/NotificationCenter/Gateway/File.php b/library/NotificationCenter/Gateway/File.php
index 8df46146..1bb94b0e 100644
--- a/library/NotificationCenter/Gateway/File.php
+++ b/library/NotificationCenter/Gateway/File.php
@@ -44,7 +44,7 @@ public function send(Message $objMessage, array $arrTokens, $strLanguage = '')
             return false;
         }
 
-        $strFileName = String::recursiveReplaceTokensAndTags(
+        $strFileName = \Haste\Util\StringUtil::recursiveReplaceTokensAndTags(
             $objLanguage->file_name,
             $arrTokens,
             String::NO_TAGS | String::NO_BREAKS
@@ -58,7 +58,7 @@ public function send(Message $objMessage, array $arrTokens, $strLanguage = '')
         }
 
         // Preserve all tags here as this is pretty useful in XML :-)
-        $strContent = String::recursiveReplaceTokensAndTags(
+        $strContent = \Haste\Util\StringUtil::recursiveReplaceTokensAndTags(
             $objLanguage->file_content,
             $arrTokens
         );
diff --git a/library/NotificationCenter/MessageDraft/EmailMessageDraft.php b/library/NotificationCenter/MessageDraft/EmailMessageDraft.php
index 39f6ff87..51514aa3 100644
--- a/library/NotificationCenter/MessageDraft/EmailMessageDraft.php
+++ b/library/NotificationCenter/MessageDraft/EmailMessageDraft.php
@@ -56,7 +56,7 @@ public function getSenderEmail()
     {
         $strSenderAddress = $this->objLanguage->email_sender_address ?: $GLOBALS['TL_ADMIN_EMAIL'];
 
-        return String::recursiveReplaceTokensAndTags($strSenderAddress, $this->arrTokens, String::NO_TAGS | String::NO_BREAKS);
+        return \Haste\Util\StringUtil::recursiveReplaceTokensAndTags($strSenderAddress, $this->arrTokens, String::NO_TAGS | String::NO_BREAKS);
     }
 
     /**
@@ -67,7 +67,7 @@ public function getSenderName()
     {
         $strSenderName = $this->objLanguage->email_sender_name ?: $GLOBALS['TL_ADMIN_NAME'];
 
-        return String::recursiveReplaceTokensAndTags($strSenderName, $this->arrTokens, String::NO_TAGS | String::NO_BREAKS);
+        return \Haste\Util\StringUtil::recursiveReplaceTokensAndTags($strSenderName, $this->arrTokens, String::NO_TAGS | String::NO_BREAKS);
     }
 
     /**
@@ -104,7 +104,7 @@ public function getBccRecipientEmails()
     public function getReplyToEmail()
     {
         if ($this->objLanguage->email_replyTo) {
-            return String::recursiveReplaceTokensAndTags($this->objLanguage->email_replyTo, $this->arrTokens, String::NO_TAGS | String::NO_BREAKS);
+            return \Haste\Util\StringUtil::recursiveReplaceTokensAndTags($this->objLanguage->email_replyTo, $this->arrTokens, String::NO_TAGS | String::NO_BREAKS);
         }
 
         return '';
@@ -116,7 +116,7 @@ public function getReplyToEmail()
      */
     public function getSubject()
     {
-        return String::recursiveReplaceTokensAndTags($this->objLanguage->email_subject, $this->arrTokens, String::NO_TAGS | String::NO_BREAKS);
+        return \Haste\Util\StringUtil::recursiveReplaceTokensAndTags($this->objLanguage->email_subject, $this->arrTokens, String::NO_TAGS | String::NO_BREAKS);
     }
 
     /**
@@ -140,7 +140,7 @@ public function getPriority()
     public function getTextBody()
     {
         $strText = $this->objLanguage->email_text;
-        $strText = String::recursiveReplaceTokensAndTags($strText, $this->arrTokens, String::NO_TAGS);
+        $strText = \Haste\Util\StringUtil::recursiveReplaceTokensAndTags($strText, $this->arrTokens, String::NO_TAGS);
 
         return \Controller::convertRelativeUrls($strText, '', true);
     }
@@ -159,7 +159,7 @@ public function getHtmlBody()
             // Prevent parseSimpleTokens from stripping important HTML tags
             $GLOBALS['TL_CONFIG']['allowedTags'] .= '<doctype><html><head><meta><style><body>';
             $strHtml = str_replace('<!DOCTYPE', '<DOCTYPE', $objTemplate->parse());
-            $strHtml = String::recursiveReplaceTokensAndTags($strHtml, $this->arrTokens);
+            $strHtml = \Haste\Util\StringUtil::recursiveReplaceTokensAndTags($strHtml, $this->arrTokens);
             $strHtml = \Controller::convertRelativeUrls($strHtml, '', true);
             $strHtml = str_replace('<DOCTYPE', '<!DOCTYPE', $strHtml);
 
diff --git a/library/NotificationCenter/Util/String.php b/library/NotificationCenter/Util/String.php
index 8028a6f9..445a36c9 100644
--- a/library/NotificationCenter/Util/String.php
+++ b/library/NotificationCenter/Util/String.php
@@ -11,6 +11,8 @@
 namespace NotificationCenter\Util;
 
 
+use Haste\Haste;
+
 class String
 {
     /**
@@ -23,106 +25,44 @@ class String
 
     /**
      * Recursively replace simple tokens and insert tags
-     * @param   string $strText
-     * @param   array  $arrTokens Array of Tokens
-     * @param   int    $intTextFlags Filters the tokens and the text for a given set of options
      *
-     * @return  string
+     * @param string $strText
+     * @param array  $arrTokens    Array of Tokens
+     * @param int    $intTextFlags Filters the tokens and the text for a given set of options
+     *
+     * @return string
+     *
+     * @deprecated Deprecated since version 1.3.1, to be removed in version 2.
+     *             Use Haste\Util\StringUtil::recursiveReplaceTokensAndTags() instead.
      */
     public static function recursiveReplaceTokensAndTags($strText, $arrTokens, $intTextFlags = 0)
     {
-        if ($intTextFlags > 0) {
-            $arrTokens = static::convertToText($arrTokens, $intTextFlags);
-        }
-
-        // Must decode, tokens could be encoded
-        $strText = \String::decodeEntities($strText);
-
-        // Replace all opening and closing tags with a hash so they don't get stripped
-        // by parseSimpleTokens() - this is useful e.g. for XML content
-        $strHash                = md5($strText);
-        $strTagOpenReplacement  = 'NC-TAG-OPEN-' . $strHash;
-        $strTagCloseReplacement = 'NC-TAG-CLOSE-' . $strHash;
-        $arrOriginal            = array('<', '>');
-        $arrReplacement         = array($strTagOpenReplacement, $strTagCloseReplacement);
-
-        $strText = str_replace($arrOriginal, $arrReplacement, $strText);
-
-        // first parse the tokens as they might have if-else clauses
-        $strBuffer = \String::parseSimpleTokens($strText, $arrTokens);
-
-        $strBuffer = str_replace($arrReplacement, $arrOriginal, $strBuffer);
-
-        // then replace the insert tags
-        $strBuffer = \Haste\Haste::getInstance()->call('replaceInsertTags', array($strBuffer, false));
-
-        // check if the inserttags have returned a simple token or an insert tag to parse
-        if ((strpos($strBuffer, '##') !== false || strpos($strBuffer, '{{') !== false) && $strBuffer != $strText) {
-            $strBuffer = static::recursiveReplaceTokensAndTags($strBuffer, $arrTokens, $intTextFlags);
-        }
-
-        $strBuffer = \String::restoreBasicEntities($strBuffer);
-
-        if ($intTextFlags > 0) {
-            $strBuffer = static::convertToText($strBuffer, $intTextFlags);
-        }
-
-        return $strBuffer;
+        return \Haste\Util\StringUtil::recursiveReplaceTokensAndTags($strText, $arrTokens, $intTextFlags);
     }
 
     /**
      * Convert the given array or string to plain text using given options
-     * @param   mixed
-     * @param   int
-     * @return  mixed
+     *
+     * @deprecated Deprecated since version 1.3.1, to be removed in version 2.
+     *             Use Haste\Util\StringUtil::convertToText() instead.
+     *
+     * @param mixed $varValue
+     * @param int   $options
+     *
+     * @return mixed
      */
     public static function convertToText($varValue, $options)
     {
-        if (is_array($varValue)) {
-            foreach ($varValue as $k => $v) {
-                $varValue[$k] = static::convertToText($v, $options);
-            }
-
-            return $varValue;
-        }
-
-        // Replace friendly email before stripping tags
-        if (!($options & static::NO_EMAILS)) {
-            $arrEmails = array();
-            preg_match_all('{<.+@.+\.[A-Za-z]{2,6}>}', $varValue, $arrEmails);
-
-            if (!empty($arrEmails[0])) {
-                foreach ($arrEmails[0] as $k => $v) {
-                    $varValue = str_replace($v, '%email' . $k . '%', $varValue);
-                }
-            }
-        }
-
-        // Remove HTML tags but keep line breaks for <br> and <p>
-        if ($options & static::NO_TAGS) {
-            $varValue = strip_tags(preg_replace('{(?!^)<(br|p|/p).*?/?>\n?(?!$)}is', "\n", $varValue));
-        }
-
-        // Remove line breaks (e.g. for subject)
-        if ($options & static::NO_BREAKS) {
-            $varValue = str_replace(array("\r", "\n"), '', $varValue);
-        }
-
-        // Restore friendly email after stripping tags
-        if (!($options & static::NO_EMAILS) && !empty($arrEmails[0])) {
-            foreach ($arrEmails[0] as $k => $v) {
-                $varValue = str_replace('%email' . $k . '%', $v, $varValue);
-            }
-        }
-
-        return $varValue;
+        return \Haste\Util\StringUtil::convertToText($varValue, $options);
     }
 
     /**
      * Gets an array of valid attachments of a token field
-     * @param   string
-     * @param   array Tokens
-     * @return  array
+     *
+     * @param string $strAttachmentTokens
+     * @param array  $arrTokens
+     *
+     * @return array
      */
     public static function getTokenAttachments($strAttachmentTokens, array $arrTokens)
     {
@@ -145,18 +85,20 @@ public static function getTokenAttachments($strAttachmentTokens, array $arrToken
 
     /**
      * Generate CC or BCC recipients from comma separated string
-     * @param string
+     *
+     * @param string $strRecipients
+     * @param array  $arrTokens
+     *
+     * @return array
      */
     public static function compileRecipients($strRecipients, $arrTokens)
     {
         // Replaces tokens first so that tokens can contain a list of recipients.
-        $strRecipients = static::recursiveReplaceTokensAndTags($strRecipients, $arrTokens, static::NO_TAGS | static::NO_BREAKS);
+        $strRecipients = \Haste\Util\StringUtil::recursiveReplaceTokensAndTags($strRecipients, $arrTokens, static::NO_TAGS | static::NO_BREAKS);
         $arrRecipients = array();
 
         foreach ((array) trimsplit(',', $strRecipients) as $strAddress) {
             if ($strAddress != '') {
-                $strAddress = static::recursiveReplaceTokensAndTags($strAddress, $arrTokens, static::NO_TAGS | static::NO_BREAKS);
-
                 list($strName, $strEmail) = \String::splitFriendlyEmail($strAddress);
 
                 // Address could become empty through invalid insert tag