paypal new express checkout documention

https://developer.paypal.com/docs/classic/api/merchant/DoExpressCheckoutPayment_API_Operation_NVP/
https://developer.paypal.com/docs/classic/express-checkout/ht_ec-orderAuthPayment-curl-etc/#step-6-capture-the-first-payment-future


express checkout method
https://developer.paypal.com/docs/classic/api/merchant/SetExpressCheckout_API_Operation_NVP/
1.SetExpressCheckout
https://developer.paypal.com/docs/classic/api/merchant/GetExpressCheckoutDetails_API_Operation_NVP/
2.GetExpressCheckoutDetails
https://developer.paypal.com/docs/classic/api/merchant/DoExpressCheckoutPayment_API_Operation_NVP/
3.DoExpressCheckoutPayment



https://gist.github.com/xcommerce-gists/4121491

https://github.com/GeorgeOld/Paypal-NVP-PHP-code-examples