Automation library · Money admin

Verify receipts and invoices with OpenAI and Slack

Started by another system calling it, and works across Google Sheets and Slack. It hands the judgement calls to OpenAI. 13 steps, 1 branch: a working afternoon to understand properly.

MediumCalls a model: OpenAI

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

The flow

Starts it 3Model 2Logic 5Service 3

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

  1. 1Document Upload WebhookWebhookStarts it
  2. 2Error TriggerError triggerStarts it
  3. 3OpenAI Chat ModelLm Chat Open AiModel
  4. 4Normalize InputCodeLogic
  5. 5Alert EngineeringSlackService
  6. 6AI AgentAgentModel
  7. 7Parse ExtractionCodeLogic
  8. 8Build Error VerdictCodeLogic
  9. 9Validate Against BookingCodeLogic
  10. 10Record ResultGoogle SheetsService
  11. 11Auto Approve?IfLogic
  12. 12RespondRespond To WebhookStarts it
  13. 13Flag For ReviewSlackService

How it's built

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

Questions

What does it need to run?

An n8n account, plus your own Google Sheets 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. 13 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 13 steps before you point it at anything that matters.