Automation library · Money admin

Process and validate invoices with OpenAI and PostgreSQL

Started by another system calling it, and works across Postgres and Slack. It hands the judgement calls to OpenAI. 14 steps, 1 branch: a working afternoon to understand properly.

MediumCalls a model: OpenAI

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14 stepsMedium: a working afternoon
1Branch: places the flow splits
0Loops or waits
2Services it connects to

The flow

Starts it 3Model 2Logic 4Service 5

The steps in the order they run, from what starts it.

  1. 1OpenAI Chat ModelLm Chat Open AiModel
  2. 2Invoice Upload Trigger1WebhookStarts it
  3. 3AI Invoice ParserChain LlmModel
  4. 4Invoice File ExtractorExtract From FileService
  5. 5Invoice FormatterCodeLogic
  6. 6OCR Text CleanerCodeLogic
  7. 7Invoice Validation CheckIfLogic
  8. 8Invoice DB StoragePostgresService
  9. 9Failed Invoice FormatterCodeLogic
  10. 10Finance Notification SystemSlackService
  11. 11Failed Invoice LogsPostgresService
  12. 12Success ResponseRespond To WebhookStarts it
  13. 13Invoice Failure AlertSlackService
  14. 14Error ResponseRespond To WebhookStarts it

How it's built

Starts on
Another system calling it
Steps
14, with 1 branch
Size
Medium: a working afternoon
Connects to
Postgres, Slack
Model
OpenAI

Questions

What does it need to run?

An n8n account, plus your own Postgres and Slack accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on another system calling it.

Does it use AI?

Yes. It calls OpenAI. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 14 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

Before you run it

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 14 steps before you point it at anything that matters.