This plugin is not longer maintained. As you can connect your spree store with aftership directly by using:
No more plugin or file modified is needed.
This free extension automatically import any new tracking numbers from your Spree store to AfterShip.
Users > Edit, and make sure the user has an
Adminrole. Finding Spree API.
Shipments imported to your AfterShip account will be matched with the correct couriers and tracked automatically for free at AfterShip. Each free account comes with a Dashboard to monitor the current statuses of all shipments. You can also filter your shipments by dates, statuses, couriers and destination. Find out if all your shipments are delivered on time and discover any exceptions.
Upgrade to Premium to send out delivery notifications to customers or yourself. Your choice of notification triggers - In transit, Out for delivery, Delivered, Failed delivery attempt or Exceptions. Use your own email to send out notifications, and customize messages to add store logo, URL, a tracking link to get more returned customers after shipping!
Copyright (c) 2013 AfterShip Ltd. , released under the New BSD License