Case Studies
Automation, integrations, accounting systems, and open-source engineering.
Tutorial: build a resilient CLI for a click-first supplier portal
How hamberger-dl replaces repeated portal clicks with a Bash CLI: Keycloak OIDC with PKCE, protected token caching, filtered REST retrieval, safe PDF re-runs, and ZIP exports.
Tutorial: attach payout evidence without wrong matches
A scheduled n8n pattern that attaches payout PDFs to the right Lexware vouchers: destination pre-checks, explicit match states, dry runs, paced writes, and per-item audit outcomes.
Tutorial: turn supplier PDFs into idempotent Lexware records
A production n8n pattern for parsing German supplier invoices, preserving printed tax buckets, detecting credit notes, avoiding duplicate vouchers, and attaching source evidence.