Shopify/active_fulfillment — pull request #17 by csaunders (2012-10-04 14:40:21+00:00)
Title: Ensure that all tracking numbers for a fulfillment are retrieved

In order to not fully hose the API, we return all tracking numbers
as a comma separated string. This should fix any issues related with
having an order be fulfilled via multiple fulfillment centers (hence
the requirement for different tracking numbers)

Please review @jduff @odorcicd