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i facing some problem in Paypal integration,

i find error of this block mainly last line of code on debug time .

ReceiverList sl = new ReceiverList();
           PayRequest req = new PayRequest(new RequestEnvelope("en_US"), "PAY",
                              cancelURl, "USD",
                              sl, returnURL);
           req.reverseAllParallelPaymentsOnError = true;
           AdaptivePaymentsService service = new AdaptivePaymentsService();

           PayResponse resp = null;

           resp = service.Pay(req);

error is :
Invalid HTTP response The underlying connection was closed: An unexpected error occurred on a send.

What I have tried:

Update API Setting on Paypal Account etc ..
Updated 28-May-16 7:43am
PraveenDora 1-Jun-16 19:57pm    
I am not an expert with paypal , it appears issus with certificates .. are you sending certificates info in request object ?

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