/// structure in Section 4).
  ///
  /// Plugins:
  ///   * Must set `status` to `TF_OK` if transaction successfuly finalized.
  ///   * Must set `status` to `TF_NOT_FOUND` if token is invalid/not found
  ///   * Might use any other error value for `status` to signal other errors.
  int (*end_transaction)(const TF_Filesystem* filesystem,
                         TF_TransactionToken* token, TF_Status* status);