add maildomain from customfield

app/Http/Actions/CreateAccount.php

@@ -10,6 +10,7 @@ use ModulesGarden\Servers\ZimbraEmail\App\Libs\Zimbra\Components\Api\Soap\Models
 use ModulesGarden\Servers\ZimbraEmail\App\Traits\ExtensionsCheckerTrait;
 use ModulesGarden\Servers\ZimbraEmail\Core\App\Controllers\Instances\AddonController;
 use ModulesGarden\Servers\ZimbraEmail\App\Traits\HostingService;
+use \ModulesGarden\Servers\ZimbraEmail\Core\UI\Traits\WhmcsParams;
 
 /**
  *
@@ -23,7 +24,8 @@ class CreateAccount extends AddonController
 {
     use ExtensionsCheckerTrait;
     use HostingService;
-
+    use WhmcsParams;
+    
     /**
      * create domain in zimbra
      *