Start with....
select :WORKSPACE_ID from dual;
In the SQL Workshop's "SQL Command Processor" to determine your workspaces workspace_id (also known as a security_group_id internally). Assuming that query came back with a value of 12345, you could then run a block like.
BEGIN
wwv_flow_api.set_security_group_id(p_security_group_id=>12345);
wwv_flow_fnd_user_api.create_fnd_user(
p_user_name => 'regular_user',
p_email_address => 'myemail@mydomain.com',
p_web_password => 'regular1') ;
wwv_flow_fnd_user_api.create_fnd_user(
p_user_name => 'developer_user',
p_email_address => 'myemail@mydo.com',
p_web_password => 'dev1',
p_developer_privs => 'ADMIN') ;
end;
/
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