Our own ACME server already supports pre-authz but I believe the Pebble server doesn't. I would appreciate it if someone could offer some help on where to start and how to go about this and also who to contact in case I need help.
Yes, but I'm not trying to contribute to Pebble. I was just mentioning that to emphasize that our ACME server does support pre-authz for manual integration testing, even though Pebble might not. I just need some guidance for implementing pre-authz for Certbot. Like where to start and which scripts I have to modify.
Ah, sorry, I misunderstood. This is the forum for Let's Encrypt, who maintains Boulder and Pebble as well as operating the Let's Encrypt CA, but do not maintain Certbot.