In iron.io settings 'token' is the first field and 'Project ID' is the second. The proposed order makes it less error prone.
@@ -51,8 +51,8 @@ return array(
'iron' => array(
'driver' => 'iron',
'host' => 'mq-aws-us-east-1.iron.io',
- 'project' => 'your-project-id',
'token' => 'your-token',
+ 'project' => 'your-project-id',
'queue' => 'your-queue-name',
),