Citing a Zotero paper (with a link to Zotero) + adding it to References -- best way?

Sorry for the late reply - you’re welcome!

There’s two ways to go about this. Either you use the built-in citeproc (citation processing) provided by Pandoc by supplying the necessary arguments: --citeproc, --bibliography and --csl (citation style language). This will convert your citekeys into properly formatted citations in plain text, according to the style language you specified.

Or - and this is what I recommend - you can use a filter provided by the maintainer of the Better Bibtex to convert the citekeys into formatted and editable citations in your ODT document.

You’ll find the needed filter here: Markdown/Pandoc :: Better BibTeX for Zotero

If the instructions linked above are insufficient, see my walkthrough here:

or this writeup by @Luhmann: Instructions for Exporting to Word with "live" Zotero Citations