Change Apps User Password from Backend

DECLARE
   v_user_name      VARCHAR2 (30) := 'USER_NAME';
   v_new_password   VARCHAR2 (30) := 'oracle123';
   v_status         BOOLEAN;
BEGIN
   v_status :=
      fnd_user_pkg.ChangePassword (username      => v_user_name,
                                   newpassword   => v_new_password);

   IF v_status = TRUE
   THEN
      DBMS_OUTPUT.put_line (
         'The password reset successfully for the User:' || v_user_name);
      COMMIT;
   ELSE
      DBMS_OUTPUT.put_line (
            'Unable to reset password due to'
         || SQLCODE
         || ' '
         || SUBSTR (SQLERRM, 1, 100));
      ROLLBACK;
   END IF;
END;