How to resume replication?

If I created a publication and replication slot, added and updated some table records.
later I exited my program but the table records still be updated or added.
How can I resume the replication from last time when my program exited?
For example, I replicated 5 records while my program is running, after my program exited, added another 5 new records into postgresql tables, How can I continue to replicate the new table records from number 6 to 10 if my program run again?
call pglogrepl.SendStandbyStatusUpdate method or other methods?
@jackc Thanks!

Start by reading the issue's PostgreSQL logical replication scenario and the pglogrepl.SendStandbyStatusUpdate entry point. Determine how replication state is persisted and resumed after process exit, then document the steps needed to continue from the last replicated position and verify that new records are not replayed or skipped.

Written by the indexing model from the issue text.