title: Verify paypal payment using C#
body: <p>I'm quite new to PayPal integration.</p>
  
  <p>Currently I'm working on a mobile app that allows me to make payment to my merchant. However, after making a payment using the app, the transaction is reflected as "pending". I've read in some places I am required to verify the payment. </p>
  
  <p>I've don't quite understand how it works, because I need to write it in C# however most of the documentation requires me to do a cURL command. </p>
  
  <p>Any place or documentation that allows me to get started with the verification of payment?</p>
  
  <p>Any help would be greatly appreciated, thank you! </p>