code: def post_license_request(request):
      
      uuid_ = request.matchdict['uuid']
  
      posted_data = request.json
      license_url = posted_data.get('license_url')
      licensors = posted_data.get('licensors', [])
      with db_connect() as db_conn:
          with db_conn.cursor() as cursor:
              cursor.execute("""\
  SELECT l.url
  FROM document_controls AS dc
  LEFT JOIN licenses AS l ON (dc.licenseid = l.licenseid)
  WHERE uuid = %s::UUID""", (uuid_,))
              try:
                  # Check that the license exists
                  existing_license_url = cursor.fetchone()[0]
              except TypeError:  # NoneType
                  if request.has_permission('publish.create-identifier'):
                      cursor.execute("""\
  INSERT INTO document_controls (uuid) VALUES (%s)""", (uuid_,))
                      existing_license_url = None
                  else:
                      raise httpexceptions.HTTPNotFound()
              if existing_license_url is None and license_url is None:
                  raise httpexceptions.HTTPBadRequest("license_url is required")
              elif (license_url != existing_license_url or
                    existing_license_url is None):
                  cursor.execute("""\
  UPDATE document_controls AS dc
  SET licenseid = l.licenseid FROM licenses AS l
  WHERE url = %s and is_valid_for_publication = 't'
  RETURNING dc.licenseid""",
                                 (license_url,))
                  try:
                      # Check that it is a valid license id
                      cursor.fetchone()[0]
                  except TypeError:  # None returned
                      raise httpexceptions.HTTPBadRequest("invalid license_url")
              upsert_license_requests(cursor, uuid_, licensors)
  
      resp = request.response
      resp.status_int = 202
      return resp
docs: Submission to create a license acceptance request.