I have created and installed a cert for my wildcard domain
*.example.com OK using a dns challenge. So far, so good.
Now I want to renew the cert using a cronjob. I will need to use the http challenge because my DNS host has no API mechanism for me to automatically create the TXT record. What I don't understand is how to tell certbot/letsencrypt where my http server is, given the domain is a wildcard that doesn't point to the server where I'm running certbot.