014 GitHub stars
02Apply discount codes and update existing checkouts (ucp_checkout_update)
03Create and manage shopping cart sessions, adding items and buyer information (ucp_checkout_create)
04Complete purchases by submitting payment and receiving order IDs (ucp_checkout_complete)
05Set up shipping by automatically selecting addresses and delivery options (ucp_checkout_set_fulfillment)
06Discover merchant capabilities and supported payment methods (ucp_discover)