Kyle Moloney
Procurement & Operations | 10+ Years
Kyle has spent over a decade managing procurement and operations for manufacturing companies ranging from small food producers to mid-size contract manufacturers. He now writes about practical inventory management, supply chain, and production operations.
Connecting Amazon to Nstock takes a few minutes, and like the QuickBooks integration, it uses Login with Amazon — there are no API keys to generate or paste. You sign in to Seller Central, approve access, and you're connected. For the bigger picture on what the integration does once it's connected, see Amazon Inventory Integration for Manufacturers.
This walkthrough matches Nstock's in-app setup guide exactly (you'll find it linked from the Amazon Integration page once you're logged in), with a bit more context on why each step matters.
Before you start
You'll need an active Amazon Seller Central account with SP-API app authorization enabled — check Amazon's own requirements for your seller plan, since Amazon controls that eligibility, not Nstock. On the Nstock side, the Amazon integration is part of the integrations add-on on Starter and Pro plans, and included at no extra cost on the Business plan.
One important caveat before you begin: Nstock's Amazon app is still going through Amazon's application review process, so connections currently use Amazon's self-authorization mode — this only works for the seller account tied to the app in Amazon's Developer Console, not yet every customer. Check with your Nstock contact on current availability before starting.
Step 1: Open the Amazon Integration page
From Integrations in your Nstock account, open the Amazon Integration page. If you haven't connected yet, you'll see a Connect button and a link to this setup guide.
Step 2: Click "Connect to Amazon"
Click the Connect button. Nstock redirects you to Amazon Seller Central's own authorization page — you're briefly leaving the Nstock app to complete this step on Amazon's site.
Step 3: Sign in to Seller Central
Use the same Amazon account you use to access Seller Central for the seller account you want to connect. There's nothing Nstock-specific about this screen — it's the same sign-in Amazon uses for any app requesting SP-API access.
Step 4: Review and approve access
Seller Central shows you exactly what Nstock is requesting access to — order and inventory data. Review it and approve to complete the connection.
Step 5: Get redirected back to Nstock, connected
You'll land back on Nstock's Amazon Integration page, now showing your connected seller account and marketplaces. Nothing changes to your inventory yet — both "Deduct inventory for Fulfilled by Merchant (FBM) orders" and "Import Fulfilled by Amazon (FBA) orders for reporting" are off by default until you turn them on here.
Step 6: Turn on the settings you want
Decide which of the two toggles fit your operation. If you fulfill any orders yourself, turn on FBM inventory deduction so those orders deduct finished goods the same way a Shopify or WooCommerce order does. If you want Amazon-fulfilled orders counted in your sales and COGS reporting, turn on FBA order import — this never deducts your Nstock inventory, since that stock already shipped to Amazon before the order was placed.
Step 7: Run your first sync
Click Sync Orders Now to pull in your most recent orders. There's no scheduled or automatic sync yet, so this button is how you bring in new orders whenever you want — run it now to confirm everything looks right before relying on it day to day.
What to check after your first sync
Open your orders list and confirm recent Amazon orders appear with the right fulfillment channel — FBM orders should show as deducting inventory if you turned that on, and FBA orders should show up for reporting only, with no inventory change. If a fulfilled FBM order didn't deduct stock, double-check that the FBM toggle is turned on; if an FBA order shows an inventory deduction, that would be a bug worth reporting to Nstock support, since FBA orders are designed to never touch your Nstock inventory.
Frequently Asked Questions
Do I need to paste any API keys?
No. Amazon uses Login with Amazon (LWA), the same kind of "sign in with..." flow used by many apps — there are no keys or secrets to copy and paste. Signing in and approving access is all that's required.
Will connecting immediately start changing my inventory?
No. Connecting only establishes the link between Nstock and your Amazon seller account. Deducting inventory for FBM orders and importing FBA orders for reporting are both off by default until you turn them on from the Amazon Integration page.
How does Nstock treat FBA orders differently from FBM orders?
FBM orders are ones you ship yourself, so Nstock treats them like a Shopify or WooCommerce order and can deduct your on-hand stock. FBA orders ship from Amazon's own fulfillment centers — Nstock can import them for visibility, but never deducts your Nstock inventory for them, since that stock left your warehouse when you originally shipped it into Amazon's FBA program.
Can I revoke access later?
Yes. Disconnect the integration from Nstock's Amazon Integration page at any time. Amazon doesn't provide a remote revocation endpoint for this kind of connection, so for full revocation on Amazon's side, also remove Nstock's access from Seller Central's "Manage Your Apps" page.