create schema v;
create table v.foo(
  id int primary key
);
select
  1
from
  pg_create_logical_replication_slot('reg_test', 'wal2json', false);
 ?column? 
----------
        1
(1 row)

insert into v.foo(id) values (1);
select
  data
from
  pg_logical_slot_get_changes(
	'reg_test',
    null,
    null,
	'include-pk', '1',
	'include-transaction', 'false',
	'include-timestamp', 'false',
	'include-type-oids', 'false',
	'format-version', '2',
	'actions', 'insert,update,delete'
  ) x;
                                                                 data                                                                 
--------------------------------------------------------------------------------------------------------------------------------------
 {"action":"I","schema":"v","table":"foo","columns":[{"name":"id","type":"integer","value":1}],"pk":[{"name":"id","type":"integer"}]}
(1 row)

select
  pg_drop_replication_slot('reg_test');
 pg_drop_replication_slot 
--------------------------
 
(1 row)

drop schema v cascade;
NOTICE:  drop cascades to table v.foo