# Split shared rental utility bills with Postgres and Gmail: n8n workflow

> Started by another system calling it, and works across Discord, Gmail and Postgres. 29 steps, 4 branches: large, and worth reading before you trust it with...

Source: https://millionrounds.com/workflow/split-shared-rental-utility-bills-with-postgres-and-gmail (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Content](https://millionrounds.com/workflows?category=Content#library)

# Split shared rental utility bills with Postgres and Gmail

Started by another system calling it, and works across Discord, Gmail and Postgres. 29 steps, 4 branches: large, and worth reading before you trust it with anything live.

Large

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fsplit-shared-rental-utility-bills-with-postgres-and-gmail)

**29 steps** Large: read it before trusting it with anything live

**4** Branches: places the flow splits

**0** Loops or waits

**3** Services it connects to

## The flow

Starts it 2 Logic 10 Service 17

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

- 1 **When a utility bill is forwarded** Webhook *Starts it*
- 2 **Daily follow up sweep** Schedule trigger *Starts it*
- 3 **Normalize forwarded bill** Set *Logic*
- 4 **Find bills from yesterday or older** Postgres *Service*
- 5 **Has a bill image attached** If *Logic*
- 6 **Build follow up summary** Code *Logic*
- 7 **Build GPT-4o vision request** Code *Logic*
- 8 **Alert missing image on Discord** Discord *Service*
- 9 **Email missing image notice** Gmail *Service*
- 10 **Are there open bills** If *Logic*
- 11 **Read the bill with GPT-4o vision** Http Request *Service*
- 12 **Post follow up on Discord** Discord *Service*
- 13 **Post all clear on Discord** Discord *Service*
- 14 **Parse bill fields** Code *Logic*
- 15 **Email follow up to owner** Gmail *Service*
- 16 **Is the bill readable** If *Logic*
- 17 **Is the amount positive** If *Logic*
- 18 **Store rejected bill** Postgres *Service*
- 19 **Load tenants from roster** Postgres *Service*
- 20 **Alert team on Discord** Discord *Service*
- 21 **Compute unit shares** Code *Logic*
- 22 **Email invalid bill notice** Gmail *Service*
- 23 **Store bill in Postgres** Postgres *Service*
- 24 **Store unit charges** Postgres *Service*
- 25 **Post split summary to Discord** Discord *Service*
- 26 **Email split summary to owner** Gmail *Service*
- 27 **Build tenant emails** Code *Logic*
- 28 **Email each tenant their charge** Gmail *Service*
- 29 **Mark bill done** Postgres *Service*

## How it's built

- **Starts on:** Another system calling it
- **Steps:** 29, with 4 branches
- **Size:** Large: read it before trusting it with anything live
- **Connects to:** Discord, Gmail, Postgres
- **Model:** None. This is plumbing, not judgement

## Questions

What does it need to run?

An n8n account, plus your own Discord, Gmail and Postgres accounts. 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?

Take your time. At 29 steps it is large: read it before trusting it with anything live.

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 29 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fsplit-shared-rental-utility-bills-with-postgres-and-gmail)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Discord](https://millionrounds.com/workflows?service=Discord#library)[Gmail](https://millionrounds.com/workflows?service=Gmail#library)[Postgres](https://millionrounds.com/workflows?service=Postgres#library)

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Also content, with the same services where possible, closest in size first.

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