Late reply (holiday in the US last week)
Where does the URL snippet shown in the ORA-31001 error message come from? It is not the URL shown in your SQL statement nor the snippet from the browser? Is it from the XML itself? Can't tell because you cut that off.
What version of Oracle are you using, as shown by
select * from v$version;
Also, what happens when you run this from the DB
select utl_http.request ('https://api.e-builder.net/eBoDataAPI.svc/Forms_CO',null,'file:<path to wallet directory>','<pwd>')
where you modify it to include the path to the wallet that contains the certificates associated with the HTTPS site and the password used to access that wallet?
Accessing a HTTPS site requires more setup in Oracle than accessing an HTTP site, and that site also requires a user/pass to log into it, which have to be stored in the wallet as well (I think). I'm trying to make sure you can access the site correctly and return the results.