title: PayPal Missing Credential - TransactionSearch(Classic API)
body: <p>I'm trying to call TransactionSearch. But I got exception <strong>Missing credentials Exception</strong> 
  <img src="https://i.stack.imgur.com/LwsWh.jpg" alt="enter image description here">
  here is my code</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>TransactionSearchResponseType responseTransactionSearchResponseType = new TransactionSearchResponseType();
  TransactionSearchReq requestTransactionSearch = new TransactionSearchReq();
  TransactionSearchRequestType transactionSearchRequest = new TransactionSearchRequestType("2012-12-25T00:00:00+0530");
  requestTransactionSearch.TransactionSearchRequest = transactionSearchRequest;
  
  Dictionary&lt;string, string&gt; paypalConfig = new Dictionary&lt;string, string&gt;();
  paypalConfig.Add("apiUsername", "userName");
  paypalConfig.Add("apiPassword", "passowrd");
  paypalConfig.Add("apiSignature", "Signature");
  paypalConfig.Add("appid", "appID");
  paypalConfig.Add("ipn","https://www.paypal.com/cgi-bin/webscr");
  paypalConfig.Add("url", "https://www.paypal.com/webscr&amp;cmd=_express-checkout&amp;token=");
  paypalConfig.Add("endpoint", "https://api-3t.paypal.com/2.0/");
  paypalConfig.Add("mode", "live");
  
  PayPalAPIInterfaceServiceService service = new PayPalAPIInterfaceServiceService(paypalConfig);
  responseTransactionSearchResponseType = service.TransactionSearch(requestTransactionSearch);</code></pre>
  </div>
  </div>
  
  What would be the reason for this ?
  Its not an issue with my credential . then what would me the root cause for this ?</p>
  
  <p>help me please
  Thank you</p>