Amazon SP-API
Integration & Development
Amazon's Selling Partner API is the most complex API in e-commerce. We handle the AWS IAM setup, OAuth flow, rate limit compliance, and build the specific integration your operations depend on.
Why SP-API Is So Difficult to Get Right
Complex Auth Stack
SP-API requires both Login with Amazon (LWA) OAuth tokens AND AWS SigV4 request signing. Getting either wrong means silent authentication failures.
Throttling Complexity
SP-API's Usage Plans have different rate limits per operation. Silent 429 errors that aren't handled correctly cause your data sync to fall hours behind.
AWS Infrastructure
The IAM role setup with the correct trust policy and permissions is a prerequisite that blocks progress for days if you've never done it before.
What We Build
Tech Stack
Node.js or Python · amazon-sp-api SDK · AWS Lambda · EventBridge · CloudWatch
Our Process
Registration
Set up your SP-API application and configure AWS IAM roles with the correct trust policies.
Auth
Implement LWA OAuth flow with token storage and automatic refresh before expiry.
Integration
Build the specific API endpoints your use case requires — orders, inventory, reports, or feeds.
Throttling
Implement Usage Plan compliance with exponential backoff so your sync never fails silently.
Deploy
Serverless infrastructure on AWS with CloudWatch dashboards so you can monitor performance.
Frequently Asked Questions
Which API operations do I need for order sync?
For real-time order sync, you need Orders API v0 (for pulling order data) combined with the Notifications API (for real-time ORDER_CHANGE and ORDER_STATUS_CHANGED webhooks). For batch processing, the Reports API gives you more efficient bulk access to order data.
Do you work with FBA sellers, FBM sellers, or both?
Both. FBA and FBM have different relevant APIs — FBA sellers primarily use FBA Inventory, FBA Inbound, and Fulfillment APIs, while FBM sellers focus more on Orders API and Shipping API. We've built integrations for both fulfillment models.
How long does SP-API application registration take at Amazon?
Application creation is instant, but Amazon's review of your application (for approved roles like accessing buyer contact info or financial data) can take 1–5 business days. We expedite the process by submitting complete, accurate documentation on the first submission.
Can you build a multi-seller solution (agency or SaaS)?
Yes. Multi-seller SP-API integrations use the delegated access pattern with separate refresh tokens per seller account. We've built this architecture for agencies managing multiple brands and for SaaS tools that serve the broader seller ecosystem.
What happens when Amazon changes the SP-API?
SP-API is actively evolving. We build integrations that follow the API versioning scheme, subscribe to Amazon's developer announcements, and include maintenance documentation so your team (or ours) can update to new API versions without rebuilding from scratch.
Ready to Integrate with Amazon SP-API?
Tell us what you're trying to build. We'll scope the integration and walk you through what's required — no AWS expertise needed on your end.