The flow
Starts it 3Model 3Logic 3Service 8
The steps in the order they run, from what starts it.
- 11. New Invoice Email ReceivedGmail triggerStarts it
- 2OpenAI Chat ModelLm Chat Open AiModel
- 3Webhook (Approve)WebhookStarts it
- 4Webhook (Reject)WebhookStarts it
- 5Structured Output ParserOutput Parser StructuredModel
- 62. Get Email AttachmentsGmailService
- 75. Extract Invoice Data with AIAgentModel
- 88a. Extract Invoice IDSetLogic
- 98b. Extract Invoice IDSetLogic
- 103. Extract Text from PDFExtract From FileService
- 116. Log Invoice to Google SheetGoogle SheetsService
- 129a. Update Status to ApprovedGoogle SheetsService
- 139b. Update Status to RejectedGoogle SheetsService
- 144. Prepare Text for AISetLogic
- 157. Send Approval Request to SlackSlackService
- 1610a. Send Approval ConfirmationSlackService
- 1710b. Send Rejection ConfirmationSlackService
How it's built
- Starts on
- Another system calling it
- Steps
- 17
- Size
- Medium: a working afternoon
- Connects to
- Gmail, Google Sheets, Slack
- Model
- OpenAI
Questions
What does it need to run?
An n8n account, plus your own Gmail, Google Sheets and Slack accounts, and a key for OpenAI. 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?
Yes. It calls OpenAI. 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.
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.