title: API (number of signatures), return signed document, signature location
body: <ol>
  <li>Which API request should we use to define the number of signatures</li>
  <li>Which API request should we use to define the coordination of the signature in the document (Should there be an API to set in page 6, start from which pixel. and signature area (For example:100 px X 100 px)</li>
  <li>Which API returning the signed document</li>
  </ol>