diff --git a/assets/js/src/public.js b/assets/js/src/public.js
index defbf2e02f..ca97653ed9 100644
--- a/assets/js/src/public.js
+++ b/assets/js/src/public.js
@@ -40,7 +40,7 @@ function(
             // ajax request
             MailPoet.Ajax.post({
               url: MailPoetForm.ajax_url,
-              token: MailPoetForm.token,
+              token: data.token,
               endpoint: 'subscribers',
               action: 'subscribe',
               data: data
diff --git a/lib/API/API.php b/lib/API/API.php
index 80b08bc98f..3f3b8a55c6 100644
--- a/lib/API/API.php
+++ b/lib/API/API.php
@@ -5,6 +5,13 @@ use \MailPoet\Util\Security;
 if(!defined('ABSPATH')) exit;
 
 class API {
+  private $_endpoint;
+  private $_method;
+  private $_token;
+
+  private $_endpoint_class;
+  private $_data = array();
+
   function init() {
     // security token
     add_action(
@@ -26,18 +33,80 @@ class API {
   }
 
   function setupAdmin() {
-    if($this->checkToken() === false) {
+    $this->getRequestData();
+    $this->checkToken();
+    $this->checkPermissions();
+    $this->processRoute();
+  }
+
+  function setupPublic() {
+    $this->getRequestData();
+    $this->checkToken();
+    $this->processRoute();
+  }
+
+  function getRequestData() {
+    $this->_endpoint = isset($_POST['endpoint']) ? trim($_POST['endpoint']) : null;
+    $this->_method = (isset($_POST['method']))
+      ? trim($_POST['method'])
+      : null;
+    $this->_token = (isset($_POST['token']))
+      ? trim($_POST['token'])
+      : null;
+
+    if(!$this->_endpoint || !$this->_method || !$this->_token) {
+      // throw exception bad request
       $error_response = new ErrorResponse(
         array(
-          Error::UNAUTHORIZED => __('You need to specify a valid API token.', 'mailpoet')
+          Error::BAD_REQUEST => __('Invalid request.', 'mailpoet')
         ),
         array(),
-        Response::STATUS_UNAUTHORIZED
+        Response::STATUS_BAD_REQUEST
+      );
+      $error_response->send();
+    } else {
+      $this->_endpoint_class = (
+        __NAMESPACE__."\\Endpoints\\".ucfirst($this->_endpoint)
+      );
+
+      $this->_data = isset($_POST['data'])
+        ? stripslashes_deep($_POST['data'])
+        : array();
+
+      // remove reserved keywords from data
+      if(is_array($this->_data) && !empty($this->_data)) {
+        // filter out reserved keywords from data
+        $reserved_keywords = array(
+          'token',
+          'endpoint',
+          'method',
+          'mailpoet_redirect'
+        );
+        $this->_data = array_diff_key(
+          $this->_data,
+          array_flip($reserved_keywords)
+        );
+      }
+    }
+  }
+
+  function processRoute() {
+    try {
+      $endpoint = new $this->_endpoint_class();
+      $response = $endpoint->{$this->_method}($this->_data);
+      $response->send();
+    } catch(\Exception $e) {
+      $error_response = new ErrorResponse(
+        array($e->getCode() => $e->getMessage())
       );
       $error_response->send();
     }
+  }
 
-    if($this->checkPermissions() === false) {
+  function checkPermissions() {
+    $has_permission = current_user_can('manage_options');
+
+    if($has_permission === false) {
       $error_response = new ErrorResponse(
         array(
           Error::FORBIDDEN => __('You do not have the required permissions.', 'mailpoet')
@@ -47,52 +116,23 @@ class API {
       );
       $error_response->send();
     }
-
-    $this->processRoute();
   }
 
-  function setupPublic() {
-    if($this->checkToken() === false) {
+  function checkToken() {
+    $action = $this->_endpoint.'_'.$this->_method;
+
+    $is_valid_token = wp_verify_nonce($this->_token, $action);
+
+    if($is_valid_token === false) {
       $error_response = new ErrorResponse(
         array(
-          Error::UNAUTHORIZED => __('You need to specify a valid API token.', 'mailpoet')
+          Error::UNAUTHORIZED => __('Invalid request.', 'mailpoet')
         ),
         array(),
         Response::STATUS_UNAUTHORIZED
       );
       $error_response->send();
     }
-
-    $this->processRoute();
-  }
-
-  function processRoute() {
-    $class = ucfirst($_POST['endpoint']);
-    $endpoint =  __NAMESPACE__ . "\\Endpoints\\" . $class;
-    $method = $_POST['method'];
-    $data = isset($_POST['data']) ? stripslashes_deep($_POST['data']) : array();
-
-    if(is_array($data) && !empty($data)) {
-      // filter out reserved keywords from data
-      $reserved_keywords = array(
-        'token',
-        'endpoint',
-        'method',
-        'mailpoet_redirect'
-      );
-      $data = array_diff_key($data, array_flip($reserved_keywords));
-    }
-
-    try {
-      $endpoint = new $endpoint();
-      $response = $endpoint->$method($data);
-      $response->send();
-    } catch(\Exception $e) {
-      $error_response = new ErrorResponse(
-        array($e->getCode() => $e->getMessage())
-      );
-      $error_response->send();
-    }
   }
 
   function setToken() {
@@ -101,16 +141,4 @@ class API {
     $global .= '</script>';
     echo $global;
   }
-
-  function checkPermissions() {
-    return current_user_can('manage_options');
-  }
-
-  function checkToken() {
-    return (
-      isset($_POST['token'])
-      &&
-      wp_verify_nonce($_POST['token'], 'mailpoet_token')
-    );
-  }
 }
\ No newline at end of file
diff --git a/lib/Config/Widget.php b/lib/Config/Widget.php
index 67e5a65d31..30d21f17f4 100644
--- a/lib/Config/Widget.php
+++ b/lib/Config/Widget.php
@@ -69,8 +69,7 @@ class Widget {
           'form' => $form_html,
           'mailpoet_form' => array(
             'ajax_url' => admin_url('admin-ajax.php', 'absolute'),
-            'is_rtl' => $is_rtl,
-            'token' => Security::generateToken()
+            'is_rtl' => $is_rtl
           )
         );
 
@@ -103,8 +102,7 @@ class Widget {
 
     wp_localize_script('mailpoet_public', 'MailPoetForm', array(
       'ajax_url' => admin_url('admin-ajax.php'),
-      'is_rtl' => (function_exists('is_rtl') ? (bool)is_rtl() : false),
-      'token' => Security::generateToken()
+      'is_rtl' => (function_exists('is_rtl') ? (bool)is_rtl() : false)
     ));
   }
 
diff --git a/lib/Form/Widget.php b/lib/Form/Widget.php
index ab06584387..c4d61755b7 100644
--- a/lib/Form/Widget.php
+++ b/lib/Form/Widget.php
@@ -161,7 +161,7 @@ class Widget extends \WP_Widget {
         );
 
         // generate security token
-        $data['token'] = Security::generateToken();
+        $data['token'] = Security::generateToken('subscribers_subscribe');
 
         // render form
         $renderer = new Renderer();
diff --git a/lib/Util/Security.php b/lib/Util/Security.php
index 9fdfb2624f..f916df25b7 100644
--- a/lib/Util/Security.php
+++ b/lib/Util/Security.php
@@ -5,8 +5,8 @@ if(!defined('ABSPATH')) exit;
 require_once(ABSPATH . 'wp-includes/pluggable.php');
 
 class Security {
-  static function generateToken() {
-    return wp_create_nonce('mailpoet_token');
+  static function generateToken($action = 'mailpoet_token') {
+    return wp_create_nonce($action);
   }
 
   static function generateRandomString($length = 5) {