title: capturing error messages from migs payment
body: <p>I'm having issues with my MIGS Payment facility that I created for my website. When the user encounters errors with the migs server (payment did not run successfully), how do I know if it encountered such error? </p>
  
  <p>These are the parameters I used(replaced my link with a sample link):</p>
  
  <pre><code>"vpc_Amount" =&gt; ($amount*100),
                   "vpc_Command" =&gt; 'pay',
                   "vpc_Locale" =&gt; 'en',// order id
                   "vpc_MerchTxnRef" =&gt; $session_id,
                   "vpc_Merchant" =&gt; $merchantId,
                   "vpc_OrderInfo" =&gt; "Test order",
                   "vpc_ReturnURL" =&gt; "http://mywebsite.com/returnUrL",
               "vpc_Version" =&gt; '1'
  </code></pre>
  
  <p>How do I know if it failed, since either a payment successful or a payment failure happens, it goes to the same returnURL. Can I set another link wherein it would go there if the transaction failed?</p>