diff --git a/assets/js/src/public.js b/assets/js/src/public.js
index ca97653ed9..186025c280 100644
--- a/assets/js/src/public.js
+++ b/assets/js/src/public.js
@@ -31,7 +31,7 @@ function(
         });
 
         form.parsley().on('form:submit', function(parsley) {
-          var data = form.serializeObject() || {};
+          var form_data = form.serializeObject() || {};
           // check if we're on the same domain
           if(isSameDomain(MailPoetForm.ajax_url) === false) {
             // non ajax post request
@@ -40,10 +40,11 @@ function(
             // ajax request
             MailPoet.Ajax.post({
               url: MailPoetForm.ajax_url,
-              token: data.token,
+              api_version: form_data.api_version,
+              token: form_data.token,
               endpoint: 'subscribers',
               action: 'subscribe',
-              data: data
+              data: form_data.data
             }).fail(function(response) {
               form.find('.mailpoet_validate_error').html(
                 response.errors.map(function(error) {
diff --git a/lib/Form/Block/Text.php b/lib/Form/Block/Text.php
index 2ce0b4ad81..e8e08c76c1 100644
--- a/lib/Form/Block/Text.php
+++ b/lib/Form/Block/Text.php
@@ -19,7 +19,7 @@ class Text extends Base {
 
     $html .= '<input type="'.$type.'" class="mailpoet_text" ';
 
-    $html .= 'name="'.static::getFieldName($block).'" ';
+    $html .= 'name="data['.static::getFieldName($block).']" ';
 
     $html .= 'title="'.static::getFieldLabel($block).'" ';
 
diff --git a/lib/Form/Widget.php b/lib/Form/Widget.php
index 70c37e2211..7d245038d7 100644
--- a/lib/Form/Widget.php
+++ b/lib/Form/Widget.php
@@ -1,5 +1,6 @@
 <?php
 namespace MailPoet\Form;
+use MailPoet\API\API;
 use MailPoet\Config\Renderer;
 use MailPoet\Models\Form;
 use MailPoet\Form\Renderer as FormRenderer;
@@ -159,6 +160,9 @@ class Widget extends \WP_Widget {
         // generate security token
         $data['token'] = Security::generateToken();
 
+        // add API version
+        $data['api_version'] = API::CURRENT_VERSION;
+
         // render form
         $renderer = new Renderer();
         try {
diff --git a/lib/Subscription/Form.php b/lib/Subscription/Form.php
index 4e65372caf..67088eb85d 100644
--- a/lib/Subscription/Form.php
+++ b/lib/Subscription/Form.php
@@ -1,39 +1,31 @@
 <?php
 namespace MailPoet\Subscription;
+
+use MailPoet\API\API;
 use MailPoet\API\Endpoints\Subscribers;
 use MailPoet\API\Response as APIResponse;
 use MailPoet\Util\Url;
 
 class Form {
   static function onSubmit() {
-    $reserved_keywords = array(
-      'token',
-      'endpoint',
-      'method',
-      'mailpoet_redirect'
-    );
-
-    $data = array_diff_key($_POST, array_flip($reserved_keywords));
-    $form_id = isset($data['form_id']) ? $data['form_id'] : 0;
-
-    $endpoint = new Subscribers();
-
-    $response = $endpoint->subscribe($data);
-
+    $api = new API();
+    $api->getRequestData($_REQUEST);
+    $form_id = (!empty($_REQUEST['data']['form_id'])) ? $_REQUEST['data']['form_id']: false;
+    $response = $api->processRoute();
     if($response->status !== APIResponse::STATUS_OK) {
       Url::redirectBack(array(
-        'mailpoet_error' => isset($data['form_id']) ? $data['form_id'] : true,
+        'mailpoet_error' => ($form_id) ? $form_id : true,
         'mailpoet_success' => null
       ));
     } else {
-      if(isset($response->meta['redirect_url'])) {
-        Url::redirectTo($response->meta['redirect_url']);
-      } else {
-        Url::redirectBack(array(
-          'mailpoet_success' => $form_id,
-          'mailpoet_error' => null
-        ));
-      }
+      (isset($response->meta['redirect_url'])) ?
+        Url::redirectTo($response->meta['redirect_url']) :
+        Url::redirectBack(
+          array(
+            'mailpoet_success' => $form_id,
+            'mailpoet_error' => null
+          )
+        );
     }
   }
 }
\ No newline at end of file
diff --git a/views/form/widget.html b/views/form/widget.html
index 4a8a8f24c4..bbe0062345 100644
--- a/views/form/widget.html
+++ b/views/form/widget.html
@@ -13,8 +13,9 @@
       class="mailpoet_form mailpoet_form_<%= form_type %>"
       novalidate
     >
-      <input type="hidden" name="form_id" value="<%= form.id %>" />
+      <input type="hidden" name="data[form_id]" value="<%= form.id %>" />
       <input type="hidden" name="token" value="<%= token %>" />
+      <input type="hidden" name="api_version" value="<%= api_version %>" />
       <input type="hidden" name="endpoint" value="subscribers" />
       <input type="hidden" name="mailpoet_method" value="subscribe" />