INVOICE PROCESSING

Flag Silent Vendor Invoice Increases from Gmail Inbox

Watches your billing inbox for incoming vendor invoices, extracts the amount, compares it to that vendor's last invoice.

CategoryInvoice Processing
Enginesim
Difficultyintermediate
Triggerevent
Steps6
Setup~15 min

How it runs

The automated pipeline, trigger to output.

  • TriggerNew invoice email in GmailGmailGmail
  • ActionExtract vendor and amount with OpenAIOpenAI
  • ActionLook up vendor's last amount in AirtableAirtableAirtable
  • LogicCompute percent change vs threshold
  • ActionUpdate Airtable ledger with new amountAirtableAirtable
  • OutputPost flagged increase to Slack review channelSlack

What it does

This workflow catches vendors who quietly raise their recurring charges. Each time an invoice email arrives, it pulls out the vendor name and amount, looks up the previous amount you paid that vendor, and computes the change. If the new amount is higher than your tolerance (default 3%), it posts a flagged alert to a review channel so the increase never slips through unnoticed.

When to use it

Use it when you receive vendor invoices by email and want a human to approve any price hike before it gets paid. Ideal for finance ops teams managing dozens of SaaS and service subscriptions where small recurring creep adds up to real money.

How it works

  1. 1A new email matching your invoice label arrives in Gmail.
  2. 2An OpenAI extraction step parses the sender, vendor name, invoice amount, and billing period.
  3. 3The workflow reads the vendor's last recorded amount from an Airtable ledger.
  4. 4A logic step computes percent change and compares it to the threshold.
  5. 5If the increase exceeds the threshold, it posts the old amount, new amount, and delta to Slack for review; otherwise it silently logs the run.
  6. 6The Airtable ledger is updated with the latest amount for next month's comparison.

Set it up

What you configure once, before turning it on.

  1. 1
    Connect GmailRead, draft, send, label.
  2. 2
    Connect OpenAIModels, embeddings, files.
  3. 3
    Connect AirtableBases, tables, views, automations.
  4. 4
    Connect SlackChannels, DMs, threads, mentions.
  5. 5
    Set each agent's modelWe leave models unset so you pick the tier — fast + cheap, or top-quality.
  6. 6
    Tune it to your dataEdit the prompts, filters, and field mappings so it matches how your team works.
  7. 7
    Test, then turn it onRun once against a sample, confirm the output, then enable the trigger.

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