title: DocuSign Payments REST API create Tab
body: <p>I am trying to create a sample formula tab in my DocuSign envelope creation for requesting a payment (REST API).  I have successfully created the signHere tabs for many of our products but I am now asked to create a tab where the recipient can sign first and then make a payment.  The payment gateways are set up (and tested through the normal DocuSign Account GUI) so I do not think the issue lies there.</p>
  
  <p>I am getting an "Error - Please enter a valid payment amount." once I attempt to finish... but there is no prompt for a payment amount...or way to enter any amount.</p>
  
  <p>Looking for something that would be close to this format:</p>
  
  <pre><code>    "&lt;formulaTabs&gt;" +
        "&lt;formulaTab&gt;" +
         "&lt;isPaymentAmount&gt;true&lt;/isPaymentAmount&gt;&lt;value&gt;125.00&lt;/value&gt;" +
         "&lt;tabLabel&gt;CDSetupFee&lt;/tabLabel&gt;&lt;documentId&gt;1&lt;/documentId&gt; 
          &lt;pageNumber&gt;4&lt;/pageNumber&gt;" +
         "&lt;xPosition&gt;200&lt;/xPosition&gt;&lt;yPosition&gt;630&lt;/yPosition&gt;" +
        "&lt;/formulaTab&gt;" +
      "&lt;/formulaTabs&gt;" +
  </code></pre>
  
  <p>Any ideas?</p>