I built an n8n workflow to automatically match supplier invoices with delivery notes
I’ve been learning n8n and wanted to build something closer to a real business automation, so I built this.
The idea is simple: an HVAC company receives invoices from suppliers and delivery notes from the field. The workflow extracts the information, organizes the documents, finds the relevant delivery notes for each invoice, and checks whether the delivered quantities actually match what was invoiced.
I used n8n, Google Sheets, JavaScript and an LLM for the parts that require understanding document/product descriptions.
I also added OCR failure handling, duplicate detection, exception handling and manual-review paths.
I built the whole thing as a portfolio project and put the workflow, test documents and setup on GitHub:
Would appreciate feedback from anyone who has built similar document-processing or n8n workflows.