Predict Shopify stockouts with GPT-4o and email suppliers via Gmail

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1. Workflow Overview

How it works Runs daily at 06:00 UTC, pulls every Shopify product variant's stock level, calculates real sales velocity from the last 7 days of orders, then uses GPT 4o to predict stockout dates...

Best for

CRM automation workflows
AI Summarization automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.scheduletrigger, n8n-nodes-base.shopify, n8n-nodes-base.code, @n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.lmchatopenai, @n8n/n8n-nodes-langchain.outputparserstructured, n8n-nodes-base.if

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Kumar SmartFlow Craft.

Original n8n.io source

1.1 Workflow description

Title: Predict Shopify stockouts with GPT-4o and email suppliers via Gmail
Workflow name: Predict Shopify stockouts with GPT-4o and email suppliers via Gmail

🚀 How it works

Runs daily at 06:00 UTC, pulls every Shopify product variant's stock level, calculates real sales velocity from the last 7 days of orders, then uses GPT-4o to predict stockout dates and decide whether to reorder — automatically.

🛍️ Fetches all Shopify product variants and current inventory quantities
📦 Pulls the last 7 days of orders and computes units sold per variant
⚡ Calculates sales velocity (units/day) and estimated days until stockout
🤖 AI Agent classifies risk: critical / high / medium / low and recommends reorder quantity (30-day demand + 20% safety buffer)
📧 Sends a formatted reorder request email to your supplier for high-risk variants
📊 Logs every decision (reordered or skipped) to Google Sheets for inventory tracking

🛠️ Set up steps

Estimated setup time: ~15 minutes

Shopify — create a Custom App in your Shopify Admin → Apps → Develop Apps; enable read_products and read_orders scopes; copy the Admin API Access Token
OpenAI — connect your OpenAI API credential (GPT-4o)
Gmail — connect Gmail OAuth2; replace [email protected] with your real supplier address
Google Sheets — connect Google Sheets OAuth2; replace YOUR_REORDER_LOG_SHEET_ID with your sheet ID; create a sheet tab named Reorder Log
Follow the sticky notes inside the workflow for per-node guidance

📋 Prerequisites

Shopify store (any plan with Admin API access)
OpenAI API key
Gmail account for supplier notifications
Google Sheets for reorder log

Custom Workflow Request with Personal Dashboard

[email protected]

https://www.smartflowcraft.com/contact

More free templates

https://www.smartflowcraft.com/n8n-templates

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Overview

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 2 - Prerequisites

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 3 - Setup Required

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 4 - How It Works

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 5 - Daily Inventory Check

Type / Role: n8n-nodes-base.scheduleTrigger - scheduleTrigger
Config choices: Version 1.2

Block 6 - Fetch Products note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 7 - Fetch All Products

Type / Role: n8n-nodes-base.shopify - shopify
Config choices: Version 1

Block 8 - Fetch Orders note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 9 - Fetch Recent Orders

Type / Role: n8n-nodes-base.shopify - shopify
Config choices: Version 1

Block 10 - Velocity note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 11 - Compute Sales Velocity

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 12 - Predict note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 13 - Predict Stockout Risk

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 1.8

Block 14 - OpenAI — Predict

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 15 - Stockout Risk Schema

Type / Role: @n8n/n8n-nodes-langchain.outputParserStructured - outputParserStructured
Config choices: Version 1.2

Block 16 - Should Reorder note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 17 - Should Reorder?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 18 - Email note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 19 - Send Reorder Email

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.1

Block 20 - Log note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 21 - Log to Google Sheets

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.5

3. Summary Table

Workflow	Predict Shopify stockouts with GPT-4o and email suppliers via Gmail
Complexity	advanced
Nodes	21
Categories	CRM, AI Summarization
Author	Kumar SmartFlow Craft
Published	18 Mar 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/14143/14143.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source CRM workflows AI Summarization workflows

Frequently asked questions

What does Predict Shopify stockouts with GPT-4o and email suppliers via Gmail do?

How it works Runs daily at 06:00 UTC, pulls every Shopify product variant's stock level, calculates real sales velocity from the last 7 days of orders, then uses GPT 4o to predict stockout dates...

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your CRM, AI Summarization use case.

Kumar SmartFlow Craft

6 workflows

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.scheduletrigger n8n-nodes-base.shopify n8n-nodes-base.code @n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.lmchatopenai @n8n/n8n-nodes-langchain.outputparserstructured n8n-nodes-base.if

Complexity

advanced

Published 18 Mar 2026

Likes 0

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Install path: /data/workflows/14143/14143.json

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Predict Shopify stockouts with GPT-4o and email suppliers via Gmail

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

🚀 How it works

🛠️ Set up steps

📋 Prerequisites

Custom Workflow Request with Personal Dashboard

More free templates

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Overview

Block 2 - Prerequisites

Block 3 - Setup Required

Block 4 - How It Works

Block 5 - Daily Inventory Check

Block 6 - Fetch Products note

Block 7 - Fetch All Products

Block 8 - Fetch Orders note

Block 9 - Fetch Recent Orders

Block 10 - Velocity note

Block 11 - Compute Sales Velocity

Block 12 - Predict note

Block 13 - Predict Stockout Risk

Block 14 - OpenAI — Predict

Block 15 - Stockout Risk Schema

Block 16 - Should Reorder note

Block 17 - Should Reorder?

Block 18 - Email note

Block 19 - Send Reorder Email

Block 20 - Log note

Block 21 - Log to Google Sheets

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions