How to use a custom database authentication with APEX_AUTHENTICATION??

i have Custom user authentication method.
create or replace function user_check(username varchar2,password varchar2) return boolem
is
check_out integer;
begin
select count(*) into check_out from "user" where USER_EMAIL=username and USER_PASS=password;
if check_out >0 then
return true;
else
return false;
end if;
end;
apex_authentication.login() how to use. And how to make apex_authentication.login() use my method Verify User Login

You can't mix custom authentication and the internal APEX authentication functions.. So either you use the pre-built user authentication in APEX or you can build your own CUSTOM authentication...
Many examples of custom authentication are out there...
Thank you,
Tony Miller
Ruckersville, VA

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