nbudin/google4r-checkout — pull request #16 by chancedowns (2013-03-13 15:37:24+00:00)
Title: Add Polling API

I've added the Polling API from https://developers.google.com/checkout/developer/Google_Checkout_Beta_Polling_API This API allows you to retrieve all notifications that are less than 180 days old and that are at least 30 minutes old.