tangentlabs/django-oscar-paypal — pull request #22 by izidormatusov (2013-07-12 14:46:00+00:00)
Title: Validate against zero value baskets

At the moment, the library allows these but PayPal will reject them and the customer is left with a misleading message about "An error occurred communicating with PayPal".

We should raise an exception if the value is zero.