Setting up Caddy with Porkbun

Open to suggestions for managing Caddy for domains from Porkbun.

• Porkbun itself is using Cloudflare.
• Their Caddy module is confusing to setup due to API changes and older documentation.
• I'd like to use a declarative json configuration, but first I just need Porkbun to play nice enough to work when adding subdomains via wildcard.

The Goal

Setup legit Lets' Encrypt as wildcard locally to test services at *example.domain.com, then put them into production on mainsite wildcard *.domain.com on VPS or similar.

Seeking Advice

Can anyone advise on setup recommendations. I'm currently using Nginx, which I had no difficulty setting up with ACME challenge. Perhaps I'm approaching Caddy in the wrong way. Thanks for any thoughts.