openssl.cnf - is the file you used earlier.

$ openssl req -new -config openssl.cnf -key client-new-2048.key -out client-new-2048.csr

Use Commone Name "aidanxc"

$ openssl x509 -req -days 365 -in client-new-2048.csr -signkey client-new-2048.key -out client-new-2048.crt -extfile openssl.cnf -extensions ssl_client

$ orapki wallet add -wallet ./test_wallet -user_cert -cert ./client-new-2048.crt

$ orapki wallet display -wallet ./test_wallet

Now you have wallet configured and the test .crt & .key files for curl:

- Upload client-new-2048.crt

- Try testing:
curl -q -k --cert ./client-new-2048.crt --key ./client-new-2048.key https://identitysso.betfair.com/api/certlogin -d 'username=rxelgin&password=chocolate1' -H "X-Application: curlCommandLineTest"