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Automate Three-Way Matching of Supplier Invoices

Stop paying wrong invoices — automatically match each supplier invoice against its purchase order and goods receipt, flagging any discrepancy.

difficulty Advancedsetup 45 minresult Only invoices that match the PO and receipt are approved automatically; mismatches are caught before payment.—
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  1. 1

    Receive the Invoice

    Add a Gmail Trigger node on an invoices label and extract the amount, PO number and line items.

  2. 2

    Look Up PO and Receipt

    Add Google Sheets nodes fetching the matching purchase order and goods receipt by PO number.

  3. 3

    Compare the Three

    Add a Code node checking quantities and amounts across invoice, PO and receipt within tolerance.

  4. 4

    Approve or Flag

    Add an IF node auto-approving matches for payment and posting mismatches to Slack for review.

  5. 5

    Activate and Test

    Activate the workflow and send a matching and a mismatched invoice. Confirm each is handled correctly.

Frequently asked questions

What tolerance should I allow?

A small percentage tolerance handles rounding and minor freight differences without flagging every invoice.

Can it handle partial deliveries?

Track received quantities cumulatively so invoices for partial shipments still match correctly.

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