# Detect maverick spend and alert reviewers with Slack and Gmail: n8n workflow

> Started by a clock, and works across Gmail, Google Sheets and Slack. It hands the judgement calls to Gemini.

Source: https://millionrounds.com/workflow/detect-maverick-spend-and-alert-reviewers-with-slack-and-gma (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Alerts and monitoring](https://millionrounds.com/workflows?category=Alerts+and+monitoring#library)

# Detect maverick spend and alert reviewers with Slack and Gmail

Started by a clock, and works across Gmail, Google Sheets and Slack. It hands the judgement calls to Gemini. 17 steps, 1 branch, 1 loop or waits: a working afternoon to understand properly.

Medium Calls a model: Gemini

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fdetect-maverick-spend-and-alert-reviewers-with-slack-and-gma)

**17 steps** Medium: a working afternoon

**1** Branch: places the flow splits

**1** Loop or waits

**3** Services it connects to

## The flow

Starts it 1 Model 1 Logic 7 Service 8

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

- 1 **Daily Compliance Scan** Schedule trigger *Starts it*
- 2 **Get Approved Supplier List** Google Sheets *Service*
- 3 **Get Pending Transactions** Google Sheets *Service*
- 4 **Clean & Normalize Transaction Data** Set *Logic*
- 5 **Merge Supplier & Transaction Data** Merge *Logic*
- 6 **Detect Maverick Spend (Unapproved Supplier)** Code *Logic*
- 7 **Check Maverick Spend Condition** If *Logic*
- 8 **Generate AI Compliance Suggestions** Google Gemini *Model*
- 9 **Skip Approved Supplier (No Action)** Set *Logic*
- 10 **Format AI Output & Add Timestamp** Code *Logic*
- 11 **Mark Approved Transaction as Processed** Google Sheets *Service*
- 12 **Send Slack Alert (Maverick Spend)** Slack *Service*
- 13 **Send Email Alert (Violation Report)** Gmail *Service*
- 14 **Log Violation in Sheet** Google Sheets *Service*
- 15 **Mark Transaction as Processed** Google Sheets *Service*
- 16 **Wait 2 Hours Before Escalation** Wait *Logic*
- 17 **Send Escalation Alert** Slack *Service*

## How it's built

- **Starts on:** A clock
- **Steps:** 17, with 1 branch, 1 loop or waits
- **Size:** Medium: a working afternoon
- **Connects to:** Gmail, Google Sheets, Slack
- **Model:** Gemini

## Questions

What does it need to run?

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

What starts it?

It starts on a clock.

Does it use AI?

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

How long does it take to set up?

Plan an afternoon. 17 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 17 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%2Fdetect-maverick-spend-and-alert-reviewers-with-slack-and-gma)
- **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.

[Gmail](https://millionrounds.com/workflows?service=Gmail#library)[Google Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)[Slack](https://millionrounds.com/workflows?service=Slack#library)

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Also alerts and monitoring, with the same services where possible, closest in size first.

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- [**Automated error monitoring and reporting system with OpenAI** 17 steps · calls a model · Gmail, n8n data table](https://millionrounds.com/workflow/automated-error-monitoring-and-reporting-system-with-openai)
- [**Automated stock technical analysis with Grok and Gmail** 17 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/automated-stock-technical-analysis-with-grok-and-gmail)