Connect Amazon to Suppli

Suppli uses the Amazon Selling Partner API (SP-API) to push inventory updates to your Amazon listings via the Feeds API. You authorize once via OAuth and Suppli auto-refreshes tokens from there.

ℹ️ Listings must exist first: Suppli can only update inventory for listings that already exist on Amazon. The SKU in your Amazon listing must match exactly what's in Suppli's Product Mapping.

Log into Amazon Seller Central

Go to sellercentral.amazon.com and sign in. You need an active Amazon Marketplace seller account to proceed.

Create an LWA app client

In Seller Central, go to Apps & Services → Develop Apps. Click Add new app client and name it "Suppli" (or any name you prefer).

After creation you'll see your LWA Client ID and LWA Client Secret. Copy both.

ℹ️ The LWA Client ID starts with amzn1.application-oa2-client. — if yours doesn't, you may be looking at the wrong credential type.

⚠️ Never share your LWA Client Secret publicly. Store it securely — it grants access to your Amazon seller account.

Connect in Suppli

In Suppli, go to Channels → New Connection. Fill in the form:

Platform — select Amazon
Supplier — select which supplier these Amazon listings belong to
LWA Client ID — from step 2
LWA Client Secret — from step 2
Marketplace ID — use ATVPDKIKX0DER for the US marketplace
Sandbox — leave unchecked for Production

Click Save & Connect — you'll be redirected to Amazon to authorize Suppli.

ℹ️ US Marketplace ID: ATVPDKIKX0DER — this is the standard identifier for Amazon.com (US). Other marketplaces have different IDs.

Authorize Suppli in the Amazon OAuth popup

After saving credentials you'll land on Amazon's authorization page. Sign in with your seller account and click Authorize to grant Suppli access.

You'll be redirected back to Suppli and the connection will show a green Connected badge.

ℹ️ Token auto-refresh: Amazon SP-API uses OAuth 2.0. Suppli stores your refresh token and automatically renews the access token before it expires — you only need to re-authorize if you disconnect and reconnect.

Verify sync is working

After your next feed runs, confirm Suppli is pushing to Amazon:

Go to Sync logs in Suppli — look for an Amazon badge on the sync run
In Seller Central, check your listing's inventory quantity matches what Suppli pushed

⚠️ SKU must match exactly — the Seller SKU in your Amazon listing must match the Internal SKU in Suppli's Product Mapping exactly, including capitalisation. This is how Suppli identifies which listing to update.

ℹ️ How Amazon inventory updates work: Suppli uses the SP-API Feeds API (POST_INVENTORY_AVAILABILITY_DATA) to submit an XML inventory feed. Amazon processes feeds asynchronously — the update may take a few minutes to appear on your listing.

ℹ️ Only connected suppliers count: Only suppliers with an active Amazon connection contribute to the Amazon inventory total — same pattern as eBay and Walmart.

Also useful

← Walmart tutorial