title: Envelope created is empty
body: <p>When i create an envelope using the eSignature REST API, the envelope is created as Draft in Docusign and with no content, as below:</p>
  <p><a href="https://i.stack.imgur.com/p9nfJ.png" rel="nofollow noreferrer">Docusign draft</a></p>
  <p><a href="https://i.stack.imgur.com/lEbI2.png" rel="nofollow noreferrer">Envelope details</a></p>
  <p>But, if i copy the body (json) and paste in postman and if i try to create, usign the DocuSign Rest API Collection, the envelope is created properly and docusign start the worflow automatically.</p>
  <p><a href="https://i.stack.imgur.com/CjRHY.png" rel="nofollow noreferrer">Postman Envelope creation</a></p>
  <p>What i'm doing wrong? There any configuration which i need to setup? Any or suggestion?</p>
  <p>Thanks in advance,</p>
  <p>Best regards,
  Luis Franco</p>