Recent Revisions to This Document Release Changes May 2017 Added Numbered Elements. Updated the description for paypalAuthorizationId in Request Field Descriptions. August 2016 This revision contains only editorial changes and no technical updates. January 2016 This revision contains only editorial changes and no technical updates. December 2015 This revision contains only editorial changes and no technical updates. October 2015 Added information about integration for the In-Context Express Checkout flow. See PayPal Express Checkout Flows. June 2015 Added information about In-Context Express Checkout. See Introduction to PayPal Express Checkout, and Redirection URLs.