Automatically update Amazon transaction memos in YNAB with AI & Gmail

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

Who it's for This workflow is ideal for YNAB users who frequently shop on Amazon and want their ...

Best for

Document Extraction automation workflows
AI Summarization automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.manualtrigger, n8n-nodes-base.noop, n8n-nodes-base.webhook, n8n-nodes-base.scheduletrigger, @n8n/n8n-nodes-langchain.toolcalculator, @n8n/n8n-nodes-langchain.lmchatopenai, n8n-nodes-base.stickynote, n8n-nodes-base.httprequest

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Angel Menendez.

Original n8n.io source

1.1 Workflow description

Title: Automatically update Amazon transaction memos in YNAB with AI & Gmail
Workflow name: Automatically update Amazon transaction memos in YNAB with AI & Gmail

Who it's for

This workflow is ideal for YNAB users who frequently shop on Amazon and want their transaction memos to automatically show itemized purchase details. It's especially helpful for people who import bank transactions into YNAB and want to keep purchase records tidy without manual entry.

How it works

The workflow triggers on a set schedule, via a webhook, or manually. It retrieves all unapproved transactions from your YNAB budget, filters for Amazon purchases with empty memo fields, and processes each transaction individually. Using Gmail, it searches for matching Amazon emails (within ±5 days of the transaction date) and sends the email data to an AI agent powered by OpenAI. The AI extracts product names and prices, generating a concise memo line (up to 499 characters). If no valid purchase info is found, a fallback message is added instead. A 5-second delay prevents API rate limiting.

How to set up

Connect your YNAB account with valid API credentials.
Connect Gmail with OAuth2 authentication.
Add your OpenAI (or other LLM) API credentials.
Configure the schedule trigger or use manual/webhook start.
Run the workflow and monitor execution logs in n8n.

Requirements

YNAB API credentials
Gmail OAuth2 connection
OpenAI API key (or another compatible AI model)

How to customize

You can change the AI model (e.g., Gemini or Claude) or add HTML-to-Markdown conversion to lower token costs. Adjust the wait node delay to fit your API rate limits or modify the email date range for greater accuracy.

Security note: Never store or share API keys or personal email data directly in the workflow. Use credential nodes to manage sensitive information securely.

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 - When clicking ‘Test workflow’

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

Block 2 - Check Next Transaction

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

Block 3 - Webhook

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

Block 4 - Schedule Trigger

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

Block 5 - Calculator

Type / Role: @n8n/n8n-nodes-langchain.toolCalculator - toolCalculator
Config choices: Version 1

Block 6 - OpenAI Chat Model

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

Block 7 - Sticky Note

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

Block 8 - Get All Unapproved Transactions

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 9 - Split out Transactions

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

Block 10 - Extract Needed Data

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 11 - Check if Amazon Purchase

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

Block 12 - Check if Memo field is Empty

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

Block 13 - Loop Over Transactions

Type / Role: n8n-nodes-base.splitInBatches - splitInBatches
Config choices: Version 3

Block 14 - Wait 5 seconds to avoid Rate Limiting

Type / Role: n8n-nodes-base.wait - wait
Config choices: Version 1.1

Block 15 - Update Transaction Memo Field

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 16 - Update memo with Error

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 17 - Search Emails for Transaction Amount

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

Block 18 - Check if emails found

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

Block 19 - Format Emails

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 20 - Join emails together

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

Block 21 - Memo AI Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 2.2

Block 22 - Check if AI Able to parse items

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

Block 23 - Sticky Note1

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

Block 24 - Sticky Note2

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

Showing the first 24 of 30 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Automatically update Amazon transaction memos in YNAB with AI & Gmail
Complexity	advanced
Nodes	30
Categories	Document Extraction, AI Summarization
Author	Angel Menendez
Published	04 Nov 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/10516/10516.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 Document Extraction workflows AI Summarization workflows

Frequently asked questions

What does Automatically update Amazon transaction memos in YNAB with AI & Gmail do?

Who it's for This workflow is ideal for YNAB users who frequently shop on Amazon and want their ...

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 Document Extraction, AI Summarization use case.

Angel Menendez

39 workflows

Nodes

n8n-nodes-base.manualtrigger n8n-nodes-base.noop n8n-nodes-base.webhook n8n-nodes-base.scheduletrigger @n8n/n8n-nodes-langchain.toolcalculator @n8n/n8n-nodes-langchain.lmchatopenai n8n-nodes-base.stickynote n8n-nodes-base.httprequest

Complexity

advanced

Published 04 Nov 2025

Likes 0

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Install path: /data/workflows/10516/10516.json

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Automatically update Amazon transaction memos in YNAB with AI & Gmail

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Who it's for

How it works

How to set up

Requirements

How to customize

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - When clicking ‘Test workflow’

Block 2 - Check Next Transaction

Block 3 - Webhook

Block 4 - Schedule Trigger

Block 5 - Calculator

Block 6 - OpenAI Chat Model

Block 7 - Sticky Note

Block 8 - Get All Unapproved Transactions

Block 9 - Split out Transactions

Block 10 - Extract Needed Data

Block 11 - Check if Amazon Purchase

Block 12 - Check if Memo field is Empty

Block 13 - Loop Over Transactions

Block 14 - Wait 5 seconds to avoid Rate Limiting

Block 15 - Update Transaction Memo Field

Block 16 - Update memo with Error

Block 17 - Search Emails for Transaction Amount

Block 18 - Check if emails found

Block 19 - Format Emails

Block 20 - Join emails together

Block 21 - Memo AI Agent

Block 22 - Check if AI Able to parse items

Block 23 - Sticky Note1

Block 24 - Sticky Note2

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