Payum/PaypalExpressCheckoutNvp — pull request #20 by stefanorg (2013-11-16 19:18:22+00:00)
Title: let the user "Confirm Order on Paypal"

The paypal docs say that user can confirm order on paypal, setting useraction=commit variable on the SetExpressCheckout call
- use-case: https://cms.paypal.com/it/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_ECCustomizing#id0864860D0YK