Automation library · Money admin

Flag duplicate and risky AP invoices with Gmail and OpenAI

Started by an arriving email, and works across Gmail, Slack and Supabase. It hands the judgement calls to OpenAI. 15 steps, 1 branch: a working afternoon to understand properly.

MediumCalls a model: OpenAI

Download free
15 stepsMedium: a working afternoon
1Branch: places the flow splits
0Loops or waits
3Services it connects to

The flow

Starts it 1Model 6Logic 3Service 5

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

  1. 1Gmail, Invoice InboxGmail triggerStarts it
  2. 2OpenAI, ExtractLm Chat Open AiModel
  3. 3Invoice Data SchemaOutput Parser StructuredModel
  4. 4OpenAI, RiskLm Chat Open AiModel
  5. 5Fraud Risk SchemaOutput Parser StructuredModel
  6. 6Extract Invoice DataAgentModel
  7. 7Assess Fraud RiskAgentModel
  8. 8Check DuplicatesSupabaseService
  9. 9High Risk?IfLogic
  10. 10Count DuplicatesCodeLogic
  11. 11Alert SlackSlackService
  12. 12Log Invoice to SupabaseSupabaseService
  13. 13Check Vendor HistorySupabaseService
  14. 14Send Hold NoticeGmailService
  15. 15Merge All ContextCodeLogic

How it's built

Starts on
An arriving email
Steps
15, with 1 branch
Size
Medium: a working afternoon
Connects to
Gmail, Slack, Supabase
Model
OpenAI

Questions

What does it need to run?

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

What starts it?

It starts on an arriving email.

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. 15 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 15 steps before you point it at anything that matters.