SetExpressCheckout Request :
USER=&PWD=&SIGNATURE=&VERSION=&METHOD=SetExpressCheckout&CANCELURL=&RETURNURL=&PAYMENTREQUEST_0_AMT=&PAYMENTREQUEST_0_CURRENCYCODE=&PAYMENTREQUEST_0_PAYMENTACTION=&PAYMENTREQUEST_0_DESC=White T Shirt&PAYMENTREQUEST_0_CUSTOM=X-Large&
SetExpressCheckout Response :
Redirect URL : https://www.sandbox.paypal.com/checkoutnow/2?token=