Automation library · Money admin

Process supplier invoices with Slack

Started by another system calling it. It calls services over plain HTTP rather than through connectors. 16 steps, 1 branch: a working afternoon to understand properly.

Medium

Download free
16 stepsMedium: a working afternoon
1Branch: places the flow splits
0Loops or waits
0Services by connector: it calls them over plain HTTP

The flow

Starts it 3Logic 6Service 7

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

  1. 1Webhook: invoice received (email, drive or upload)WebhookStarts it
  2. 2Error triggerError triggerStarts it
  3. 3ConfigSetLogic
  4. 4Config (errors)SetLogic
  5. 5AI: extract fields from documentHttp RequestService
  6. 6Alert ops (Slack)Http RequestService
  7. 7Accounting: supplier masterHttp RequestService
  8. 8Accounting: open purchase ordersHttp RequestService
  9. 9Merge lookupsMergeLogic
  10. 10Validate: TRN, duplicate, totals, PO match, limitCodeLogic
  11. 11Route by statusSwitchLogic
  12. 12Accounting: post billHttp RequestService
  13. 13Review queue: human checkHttp RequestService
  14. 14Slack: rejected, AP notifiedHttp RequestService
  15. 15OutcomeCodeLogic
  16. 16Respond 200 (invoice handled)Respond To WebhookStarts it

How it's built

Starts on
Another system calling it
Steps
16, with 1 branch
Size
Medium: a working afternoon
Connects to
Nothing by connector; it calls services over plain HTTP
Model
None. This is plumbing, not judgement

Questions

What does it need to run?

An n8n account. 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?

No. Every step is fixed logic or a call to a service, so it does the same thing every time.

How long does it take to set up?

Plan an afternoon. 16 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 16 steps before you point it at anything that matters.