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HTML 

              
                <!DOCTYPE html>
<html>
<img src="https://s3.amazonaws.com/awsmp-logos/PandaDoc.png"></img>
<body>
  <p>Access Token: <input type="text" id="access_token"></p>
  <input type="file" id="myFile">
  <br/>
  <p>
    <button onClick="createDocument()">Create Document from PDF upload</button>
  <p><a id='docURL' href="" target="_blank"></a></p>
    <p id="responseCreate"></p>
    <button onClick="checkStatus()">Check Document Status</button> --- check for status = document.draft before sending
    <p id="responseStatus"></p>
    
    <button onClick="sendDoc()">Send Document</button> --- after document is moved to draft status it can be sent
    <p id="responseSend"></p>
  </p>

</body>

</html>
!

CSS
!

JS 

              
                function createDocument() {
  var formData = new FormData();
  formData.append("file", document.getElementById("myFile").files[0]);

  formData.append(
    "data",
    JSON.stringify({
      name: "Sample Document from PDF with Field Tags",
      recipients: [
        {
          email: "jane@example.com",
          first_name: "Jane",
          last_name: "Roe"
        }
      ],
      parse_form_fields: false
    })
  );

  var xhr = new XMLHttpRequest();

  xhr.open("POST", "https://api.pandadoc.com/public/v1/documents");
  xhr.setRequestHeader(
    "Authorization",
    "Bearer " + document.getElementById("access_token").value
  );
  //This header is removed because we are letting the browser handle boundries and set content type appropriately.
  //xhr.setRequestHeader("Content-Type", "multipart/form-data");

  xhr.onload = function() {
    document.getElementById("responseCreate").innerHTML = xhr.responseText;
    document.getElementById("docURL").href = 'https://app.pandadoc.com/a/#/document/v1/editor/'+ JSON.parse(xhr.response).id
    document.getElementById("docURL").innerHTML = 'https://app.pandadoc.com/a/#/document/v1/editor/'+ JSON.parse(xhr.response).id
  };
  xhr.send(formData);
}

function checkStatus() {
  var doc_id = JSON.parse(document.getElementById("responseCreate").innerText)
    .id;
  var xhr = new XMLHttpRequest();

  xhr.open("GET", "https://api.pandadoc.com/public/v1/documents/" + doc_id);
  xhr.setRequestHeader(
    "Authorization",
    "Bearer " + document.getElementById("access_token").value
  );
  xhr.onload = function() {
    document.getElementById("responseStatus").innerHTML = xhr.responseText;
  };
  xhr.send();
}

function sendDoc() {
  var doc_id = JSON.parse(document.getElementById("responseCreate").innerText)
    .id;
  var xhr = new XMLHttpRequest();

  xhr.open(
    "POST",
    "https://api.pandadoc.com/public/v1/documents/" + doc_id + "/send"
  );
  xhr.setRequestHeader(
    "Authorization",
    "Bearer " + document.getElementById("access_token").value
  );
  xhr.setRequestHeader("Content-Type", "application/json");
  xhr.onload = function() {
    document.getElementById("responseSend").innerHTML = xhr.responseText;
  };
  let body = {
    message: "Hello! This document was sent from the PandaDoc API.",
    silent: false
  };
  xhr.send(JSON.stringify(body));
}
!
999px

Console