If you sell on Amazon and run ERPNext, the gap between the two systems is where your margin quietly leaks. Orders land in Seller Central but not in ERPNext, so someone exports Order Reports and re-keys them as Sales Orders. FBA inventory lives in Amazon's fulfillment network while your Bin and Stock Ledger Entry say something different, and by the time the numbers disagree you have already oversold. Settlements arrive as opaque flat files that nobody reconciles against actual fees. ERPNext core has no native concept of Amazon marketplaces, fulfillment channels, or SP-API authentication — so out of the box the answer is always another CSV upload. This is where native ERPNext runs out of road.

ECOSIRE builds a proper Frappe app — not a script bolted onto a scheduler — that speaks the Amazon Selling Partner API (SP-API) directly and maps it cleanly onto ERPNext documents. The app ships as an installable Frappe module with dedicated DocTypes for Amazon Marketplace, Amazon SP-API Settings (credentials, LWA refresh token, region/endpoint), and a Amazon Sync Log for full auditability. Orders pulled from the Orders API are converted into ERPNext Sales Order and Sales Invoice documents via whitelisted server-side methods, with idempotent handling keyed on AmazonOrderId so a retried poll never double-creates. Inventory reconciliation runs off hooks.py scheduler events (cron / all / hourly) that push available quantity from ERPNext Item stock into listings for FBM and pull FBA on-hand from the FBA Inventory API, keeping fulfillment-channel stock honest on both sides.

Technically, the connector is built the way a senior Frappe engineer would want to inherit it. Amazon LWA/OAuth token exchange and AWS SigV4-style request signing are encapsulated in a versioned Python client with backoff on SP-API's rate-limit x-amzn-RateLimit-Limit headers. Document automation is wired through doc_events in hooks.py (for example, submitting a Sales Invoice can trigger a fulfillment or acknowledgment call back to Amazon), and light UI behavior — marketplace badges, a "Sync now" button on the settings form — is delivered as client scripts. Settlement Report ingestion parses the SP-API settlement flat file into ERPNext, mapping Amazon fee lines (referral, FBA, storage, refunds) to the GL accounts and cost centers you nominate, so finance reconciles against real numbers instead of guessing. Access is governed with a purpose-built Role Profile and DocType permissions so warehouse, sales, and finance users each see only what they should. Everything targets ERPNext/Frappe v15 and v16 and is delivered against your own site, not a shared multi-tenant black box.

Because this is build-to-order, we start from your actual Seller Central setup, not a generic template. During scoping we confirm your marketplaces (US/EU/UK/UAE/IN under one seller account), whether you run FBA, FBM, or both, your item and SKU mapping, tax treatment, and how settlements should hit your chart of accounts. We then build your version of the connector, prove it on a staging site with real UAT against your ERPNext data, and go live behind a rollback plan. Typical delivery is one working week from confirmed scope. You receive the source code, the git repository, documentation, a training session, and a post-go-live support window — there is no instant download, because we are building and installing software tailored to your account.