fixed API data decoding issue

- added missing features from issue #419
- removed isMailPoetPage() as the logic was flawed

lib/API/API.php

@@ -56,9 +56,16 @@ class API {
 
   static function decodeRequestData($data) {
     $data = base64_decode($data);
-    return (is_serialized($data)) ?
-      unserialize($data) :
-      self::terminateRequest(self::RESPONSE_ERROR, __('Invalid API data format.'));
+
+    if(is_serialized($data)) {
+      $data = unserialize($data);
+    }
+
+    if(!is_array($data)) {
+      $data = array();
+    }
+
+    return $data;
   }
 
   static function encodeRequestData($data) {

lib/API/Endpoints/Subscription.php

@@ -10,6 +10,7 @@ class Subscription {
 
   static function confirm($data) {
     $subscription = new UserSubscription\Pages('confirm', $data);
+    $subscription->confirm();
   }
 
   static function manage($data) {
@@ -18,5 +19,6 @@ class Subscription {
 
   static function unsubscribe($data) {
     $subscription = new UserSubscription\Pages('unsubscribe', $data);
+    $subscription->unsubscribe();
   }
 }