code: def create_jwt(integration_id, private_key_path):
      
      integration_id = int(integration_id)
  
      with open(private_key_path, 'rb') as f:
          cert_bytes = f.read()
  
      now = datetime.datetime.now()
      expiration_time = now + datetime.timedelta(minutes=9)
      payload = {
          # Issued at time
          'iat': int(now.timestamp()),
          # JWT expiration time (10 minute maximum)
          'exp': int(expiration_time.timestamp()),
          # Integration's GitHub identifier
          'iss': integration_id
      }
  
      return jwt.encode(payload, cert_bytes, algorithm='RS256')
docs: Create a JSON Web Token to authenticate a GitHub Integration or
      installation.
  
      Parameters
      ----------
      integration_id : `int`
          Integration ID. This is available from the GitHub integration's
          homepage.
      private_key_path : `str`
          Path to the integration's private key (a ``.pem`` file).
  
      Returns
      -------
      jwt : `bytes`
          JSON Web Token that is good for 9 minutes.
  
      Notes
      -----
      The JWT is encoded with the RS256 algorithm. It includes a payload with
      fields:
  
      - ``'iat'``: The current time, as an `int` timestamp.
      - ``'exp'``: Expiration time, as an `int timestamp. The expiration
        time is set of 9 minutes in the future (maximum allowance is 10 minutes).
      - ``'iss'``: The integration ID (`int`).
  
      For more information, see
      https://developer.github.com/early-access/integrations/authentication/.