title: "cUrl call failed" using 2checkout
body: <p>After installed the package which is downloaded from this github.</p>
  
  <p><a href="https://github.com/2checkout/2checkout-php" rel="nofollow">https://github.com/2checkout/2checkout-php</a></p>
  
  <pre><code>require_once("lib/Twocheckout.php");
  
  Twocheckout::privateKey('privatekey'); //Private Key
  
  Twocheckout::sellerId('sellerid'); // 2Checkout Account Number
  
  // If you want to turn off SSL verification (Please don't do this in your production environment)
  
  Twocheckout::verifySSL(false);  // this is set to true by default
  // To use your sandbox account set sandbox to true
  Twocheckout::sandbox(true);
  // All methods return an Array by default or you can set the format to 'json' to get a JSON response.
  
  Twocheckout::format('json');
  
  try {
  $charge = Twocheckout_Charge::auth(array(
      "merchantOrderId" =&gt; "123",
      "token"      =&gt; $_POST['token'],
      "currency"   =&gt; 'USD',
      "total"      =&gt; '10.00',
      "billingAddr" =&gt; array(
          "name" =&gt; 'Joe Flagster',
          "addrLine1" =&gt; '123 Main Street',
          "city" =&gt; 'Townsville',
          "state" =&gt; 'OH',
          "zipCode" =&gt; '43206',
          "country" =&gt; 'USA',
          "email" =&gt; 'testingemail@gmail.com',
          "phoneNumber" =&gt; '555-555-5555'
      )
  ));
  
  if ($charge['response']['responseCode'] == 'APPROVED') {
      echo "Thanks for your Order!";
      echo "&lt;h3&gt;Return Parameters:&lt;/h3&gt;";
      echo "&lt;pre&gt;";
      print_r($charge);
      echo "&lt;/pre&gt;";
  
  }
  } catch (Twocheckout_Error $e) {
  print_r($e-&gt;getMessage());
  }
  </code></pre>
  
  <p>After submitting the form using sandbox mode it shows the error like "cUrl call failed". How to fix this one</p>