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$ORACLE_HOME/apex/apex_rest_config.sql

apex_rest_config.sql configures RESTful services and creates the APEX_LISTENER and APEX_REST_PUBLIC_USER database users.
This script is expected to be run under sys as sysdba.
sys@ORA19> @apex_rest_config.sql
Enter a password for the APEX_LISTENER user              []
Enter a password for the APEX_REST_PUBLIC_USER user              []
...set_appun.sql
...create APEX_LISTENER and APEX_REST_PUBLIC_USER users

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