How to Integrate Amazon Vendor Central with Your ERP and Keep It Running Reliably

Connecting Amazon Vendor Central to your ERP has never been easier. The harder part is making sure the right orders are accepted, shipments are routed correctly and invoices match what actually left the warehouse. Those outcomes depend on decisions you make well before the first purchase order comes through.

For brands selling through Amazon Vendor Central, a well-designed integration can take hours of manual work out of the week. When we connected Unicorn Products’ Amazon Vendor accounts to SAP, the team saved 15 hours a week in manual checks. If you’re planning an integration or reviewing one you already have, I’d look at five areas. 

Read the Unicorn Products case study.

1. Validate your product data before connecting Amazon Vendor to your ERP

Electronic Data Interchange (EDI) and Amazon’s Selling Partner API (SP-API) are both routes for connecting Amazon Vendor to your ERP. When choosing a route, check which messages your workflow needs and who will maintain the connection when specifications change. At volume, you also need to know how messages are queued, how temporary failures are retried and what happens when a message still can’t be processed.
See Amazon’s SP-API documentation.

The issue we see most often is in the product data. Your ERP might hold one barcode for a product while Amazon uses another. An incorrect unit of measure can mean you confirm the wrong quantity, and missing carton dimensions can mean a pickup is routed as a pallet when the shipment should go as a small parcel. These issues are easy to miss in a large catalogue, especially in categories such as books or clothing.

We typically spend a few weeks validating and testing data before go-live. Compare the identifiers Amazon actually uses with your ERP records, then check units of measure, dimensions and other attributes your workflows rely on. Run representative orders through the full process, including products that ship in different pack sizes or use different shipping methods.

2. Control when Amazon receives your ASNs and invoices

The invoice should reflect the quantities on the advance shipping notice (ASN), and the ASN needs to reach Amazon first. That sounds straightforward until the ASN is recorded as “10 January, 8 am” and the invoice carries only the date “10 January”. Depending on how the records are processed, the invoice can appear to come first. That’s a sequencing issue we look for when investigating a shortage claim.

As a general rule,we recommend sending the invoice the day after the ASN. That gives you time to pick up any last-minute ASN corrections and puts the two documents on different dates, so their sequence is clearer. When you set up the delay, check how the documents are recorded on Amazon’s side as well as when your ERP sends them.

3. Give your team exceptions they can act on

A carrier outage, a catalogue change in Amazon or a flag changed in your ERP can all interrupt a workflow. An alert should tell the person receiving it which order or shipment is affected, what failed and what they can do next.

A temporary carrier outage may clear after a retry. If the same product flag keeps going missing, look at how new products are set up and fix it there. Otherwise, your team will keep correcting the same issue one order at a time.

4. Use reporting to spot problems and gather evidence

Start with the measures your team can act on, such as purchase order confirmation rates, vendor lead times and on-time shipping. For finance, the same data can help identify potential shortages or chargebacks and show where to investigate.

When you need to dispute a shortage claim, how long does it take to pull together the shipment record, proof of delivery, invoice and submission history? If those records sit in different systems, gathering the evidence can take more staff time than a small claim is worth. Bringing the records together by shipment gives finance a quicker way to see what was sent, what was invoiced and whether there’s enough evidence to challenge the claim.

5. Decide which workflows to automate and where people should stay involved

One vendor we work with is headquartered in the UK and also operates in Australia. By the time the UK team could process Australian orders manually, it was already around 4 pm in Australia. Automating that workflow lets the local operation act the same day.

In the warehouse, the right choice depends on how the team packs and ships. Automatic 3D palletisation can give teams a consistent plan for assigning cartons to pallets. Other teams get a more reliable result by scanning cartons as they pack. If your warehouse picks in waves across shifts, you may also want to release orders in batches. Make those decisions with the people doing the work, and introduce automation once the data and rules have been tested.

How the KhooCommerce API connects your systems to Amazon Vendor

KhooCommerce acts as an API bridge between Amazon Vendor and the systems you use to run your business. Using the KhooCommerce API, your ERP, warehouse system or internal tools can do the following.

• Retrieve orders and reports
• Retrieve and submit shipments and invoices
• Retrieve and update stock levels
• Access Fulfilment by Amazon (FBA) endpoints, including restock suggestions

Explore KhooCommerce’s Amazon Vendor ERP and warehouse integrations.

For example, your finance team could use the API to pull shipment and invoice records into a reconciliation workflow. If you sell through Amazon Vendor Central and also run a third-party FBA operation, your planning team can use FBA restock suggestions in its own tools.

Where AI fits into Amazon Vendor integration

AI is making it quicker to build and adapt integrations. An agent could use the KhooCommerce API to compare shipment and invoice records and flag discrepancies for someone in finance to review. The same approach can inform workflows built with the Model Context Protocol (MCP), with your team deciding what an agent can read, what it can submit and where it needs approval.

Whether you use NetSuite, Microsoft Dynamics 365 Business Central, SAP or a bespoke ERP, start with the same test. Follow one real order from purchase order to invoice and check what each system receives, when it receives it and who steps in if something fails.

Planning an Amazon Vendor ERP integration or trying to fix a recurring issue with one you already have? Talk to us, we can help.