title: Is it possible to update recurring amount in paypal express checkout?
body: <p>I have integrated the paypal recurring using express checkout. The recurring profile created successfully.</p>
  
  <p>I need to update the recurring billing amount before every recurring cycle. For that I am using 'UpdateRecurringPaymentsProfile' hash call. But I am not able update the amount of recurring billing.
  It is always giving me error.</p>
  
  <p>My code is</p>
  
  <pre><code>$nvpstr="&amp;PROFILEID=I-DB8HMA6R7F8T";
  $nvpstr.="&amp;AMT=".urlencode('50');
  $nvpstr.="&amp;CURRENCYCODE=USD";
  $nvpstr.="&amp;PAYMENTACTION=Order";
  $nvpstr.="&amp;BILLINGTYPE=RecurringPayments";
  
  $resArray=hash_call("UpdateRecurringPaymentsProfile",$nvpstr);
  </code></pre>
  
  <p>and response is:</p>
  
  <pre><code>Array
  (
      [TIMESTAMP] =&gt; 2014-12-27T10:26:00Z
      [CORRELATIONID] =&gt; 7aa715c9e9ebe
      [ACK] =&gt; Failure
      [L_ERRORCODE0] =&gt; 10001
      [L_SHORTMESSAGE0] =&gt; Internal Error
      [L_LONGMESSAGE0] =&gt; Timeout processing request
  )
  </code></pre>
  
  <p>Please suggest.</p>