freerunningtech/better_spree_paypal_express — pull request #1 by jhawthorn (2014-07-23 18:45:05+00:00)
Title: Fix for item_sum being < 0

It is possible for item sum to be negative where the order total is
above zero. This is because shipping is not included in the item total
but there may be adjustments made on the order to cover that amount