title: Marketo Rest API - Update Leads using Id
body: <p>How does one go about updating a lead using a lookupField of 'id'?  I attempted to perform an update but received a '1003 - Field 'id' not allowed' error.  Below is my request data for reference.</p>
  
  <pre><code>{
    "action": "updateOnly",
    "lookupfield": "id",
    "input": [
      {
        "id": "11",
        "Company": "TestCompany",
        "NumberOfEmployees": "100"
      }
    ]
  }
  </code></pre>