I use fireflyiii and paperlees-ngx. I did exactly what you plan to do with concourse-ci instead of n8n. I’m not extracting as much data from the receipts yet - was too lazy to implement it.

I basically have a receipts document type on paperless and a “imported” tag. Querying for all receipts which don’t have the imported tag and then creating transactions in firefly with a reference to the paperless document. The imported transaction gets two tags one to denote that it was automatically imported and one that gets removed once i manually verified the import.

Since I only scan my receipts with my phone the ocr job of paperless doesnt do too good of a job so I cant really automate more than that yet, maybe I’ll get a scanner for that.