Help Wanted: Need Expert to Finalize FBA Inventory Workflow in n8n (Amazon Seller SP-API)

Hey n8n community 👋

I’m looking for someone to help me complete my Amazon FBA Inventory sync workflow in n8n. I’ve already got multiple Amazon SP-API workflows working in n8n — including:

🧾 Orders
🌍 Marketplace Participation
📦 AWD Inventory (Amazon Warehousing & Distribution)

But I’m now trying to connect to the /fba/inventory/v1/summaries endpoint to get real-time FBA inventory levels for all of my SKUs — and this one has been a tough nut to crack.

💡 Who I’m Looking For:

Ideally someone who has:

Experience working with Amazon SP-API endpoints in n8n
Familiarity with:

🔧 Tech Stack:

Self-hosted n8n
Amazon Seller Central (private developer app)
NodeJS signature script for SigV4
Google Sheets (final destination for synced inventory data)

💬 Current Status:

LWA and IAM flows are already working
RDT enabled + scopes selected
Can successfully call some endpoints
Still receiving 403 or RDT-related errors for this FBA inventory endpoint

📨 If you’re confident with Amazon Seller endpoints or love a challenge, hit me up. We’re right on the edge of something game-changing — and I’d love your help getting across the finish line.

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