Stuck on getting access token for Credit Card (paypal)

Question

I am working on an application which uses Paypal REST API for payments. I have a client ID & secret but when I try to fetch the access token I get the following error message-

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

What could be the problem? please suggest. Thanks in advance

Answer 1

Fixed this. The version of Newtonsoft.JSON was not compatible with paypal rest API & the webconfig on server was not updated with the package includes.