I've done a ton of research on this and I've seen people asking this, but never seen an answer: Is there any way that anyone has discovered to work with the Docusign API from within Quickbase? As far as I can tell, quickbase only supports Javascript, without Node.js, and Docusign doesn't support CORS. I tried talking to both companies who won't say it isn't possible, but aren't really giving me any direction beyond the official docs, which aren't helping.
DocuSign eSignature REST API now supports CORS. So now you can make direct API calls from JavaScript in the browser to DocuSign. Use the oauth implicit grant to obtain an access token.
I suggest that you build a small Gateway that will support cors on one side and the DocuSign API on the other side