add constants

models/Received.php

@@ -16,6 +16,9 @@ namespace models;
      */
     class Received extends StandardModel
     {
+        const STATUS_UNREAD = 'unread';
+        const STATUS_READ = 'read';
+
         /**
          * Return a list of unread received for a user.
          *

models/Webhook.php

@@ -13,6 +13,10 @@ namespace models;
 
     class Webhook extends StandardModel
     {
+        const TYPE_SEND = 'send_sms';
+        const TYPE_RECEIVE = 'receive_sms';
+
+
         /**
          * Find all webhooks for a user and for a type of webhook.
          *