DBMS_SCHEDULER in apex oracle

I have an API package written. It has the GET_INFO procedure. I want this procedure to be performed in the background every 20 minutes. I understand what I should do with dbms_scheduler. But in general I do not understand where to register them . I will be grateful for the example or for your help with this)

I wrote such a code but I don't know where to use it:

BEGIN

DBMS_SCHEDULER.CREATE_JOB (

job_name = 'My_Job',

job_type = 'STORED_PROCEDURE',

job_action = 'INSERT INTO TEST2(UPDATEDAT)

VALUES (sysdate);

END;',

start_date = 'systimestamp',

repeat_interval = 'FREQ=SECONDLY;INTERVAL=5',

end_date = null,

auto_drop = FALSE,

comments = 'My new job');

END;

Here is my code and I don't know where to store it.

As the job type implies, you need a procedure to be created such as

create or replace procedure Ins_Test2 is
begin
  insert into Test2(updatedat) values(sysdate);
  commit;
end;

and then create the scheduler through

begin
  dbms_scheduler.create_job (
     job_name           =>  'My_Job',
     job_type           =>  'STORED_PROCEDURE',
     job_action         =>  'Ins_Test2',
     start_date         =>  systimestamp, 
     repeat_interval    =>  'freq=minutely; interval = 20; byday=MON,TUE,WED,THU,FRI;',
     enabled            =>  true,
     comments           => 'My new job'
  );
end;

where I added

byday=MON,TUE,WED,THU,FRI; as an extra direction if you want to run the scheduler within the working days(you can omit that part if you'd like).

systimestamp(get rid of quotes) for start_date might be replaced with an upcoming time info such as start_date => '13-FEB-20 2.00.00PM Asia/Istanbul'

in my case.

And follow by listing the created schedulers by

select job_name, next_run_date                           
  from dba_scheduler_jobs j;

And currently running ones by

select * 
  from user_scheduler_job_log l
 order by l.log_date desc;

And drop the scheduler by

begin
  dbms_scheduler.drop_job( job_name =>  'My_Job' );
end;