Recent Revisions to This Document Release Changes May 2017 This revision contains only editorial changes and no technical updates. 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 Updated the field length for payer_business in Order-Level Reply Fields. 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. September 2014 ■ Corrected field name transaction_id to paypal_transaction_id throughout the guide. ■ Removed reference to PayPal version number from the paypal_lc API request field. See paypal_lc. ■ Added bill fields to Payment Service, Authorization Service,and Order-Level Request Fields. These fields are required only when Decision Manager is enabled.