---
title: "How to build fulfilment invoice check with Claude & Rig"
description: "Match 3PL carrier invoices and rate cards to orders per SKU, flag shipments billed above the agreed rate, draft the rebate request, and read a weekly P&L on actual fulfilment costs. A step-by-step guide to building it yourself on your own data with Claude and Rig."
canonical: "https://rig.so/apps/fulfilment-invoice-check"
format: markdown
---

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OperationsWorkflowReport

# Fulfilment invoice check

Check every 3PL fulfilment invoice against your rate card

Match 3PL carrier invoices and rate cards to orders per SKU, flag shipments billed above the agreed rate, draft the rebate request, and read a weekly P&L on actual fulfilment costs.

Runs on![Shopify logo](https://img.logo.dev/shopify.com?token=pk_AdkTbLWDS1iunmvTK2qm1g&size=44&format=png&retina=true)![Stord logo](https://img.logo.dev/stord.com?token=pk_AdkTbLWDS1iunmvTK2qm1g&size=44&format=png&retina=true)![Google Sheets logo](https://img.logo.dev/sheets.google.com?token=pk_AdkTbLWDS1iunmvTK2qm1g&size=44&format=png&retina=true)

[Build this on your data](https://app.rig.so/signup)[Book a demo](https://rig.so/book-demo)

## The problem

Fulfilment costs usually arrive weeks after the orders they belong to, so the P&L runs on estimates until month-end. Checking 3PL invoices by hand takes hours each week, and overcharges slip through because nobody can match every line to the rate card and the order behind it.

## Built from Rig's building blocks

This app is one way to combine them. Use the parts you need and change the workflow to fit how your team works.

Sync your commerce platform and your 3PL

Load the agreed rate card

A workflow matches invoice lines to orders per SKU and flags overcharges

The same joined costs feed a weekly P&L

## How to build it

1. 1
   
   ### Connect your commerce platform, your 3PL and the rate card
   
   Bring orders, invoice lines and the agreed rates into one warehouse.
2. 2
   
   ### Join invoices to orders per SKU
   
   Match each invoice line to the order and SKU it belongs to, so every charge sits next to the rate it should have used.
3. 3
   
   ### Flag the overcharges
   
   Compare each charge with the rate card and list the shipments billed above it, with the difference per line.
4. 4
   
   ### Draft the rebate request
   
   Turn the flagged lines into an email to the warehouse, ready for someone on your team to check and send.
5. 5
   
   ### Feed the weekly P&L
   
   Use the same joined costs for a weekly P&L, so finance reads actual fulfilment costs instead of month-end estimates.

## The outcome

Overcharges are caught every week, the rebate request is ready to send, and the P&L uses what fulfilment actually cost.

[Build your own version](https://app.rig.so/signup)

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