code: def add_client_to_manifest(self, client_id, client_secret, manifest):
          
          client_id_key = 'PREDIX_APP_CLIENT_ID'
          manifest.add_env_var(client_id_key, client_id)
  
          client_secret_key = 'PREDIX_APP_CLIENT_SECRET'
          manifest.add_env_var(client_secret_key, client_secret)
  
          manifest.write_manifest()
docs: Add the given client / secret to the manifest for use in
          the application.