Get a location for subsequent document upload PUT request

Example response

{
  "data": {
    "id": "6d8433c1-cd55-4c24-affd-f592287a7572",
    "type": "document_upload",
    "attributes": {
      "guid": "6d8433c1-cd55-4c24-affd-f592287a7572",
      "status": "pending",
      "location": "https://sandbox-api.va.gov/services_user_content/vba_documents/{idpath}",
      "updated_at": "2018-07-30T17:31:15.958Z",
      "uploaded_pdf": "null"
    }
  }
}