Amazon Selling Partner API (SP-API)

Amazon Seller Integration, Built Around Your Store

We connect your custom store to Amazon over the official Selling Partner API — one catalog, one inventory count, orders in one place. Flat pricing, no commission on your sales.

Start Your Amazon IntegrationFrom ₹5,000 · no transaction fees

How We Integrate Amazon With Your Store

Selling on Amazon.in and global marketplaces means living inside the Selling Partner API (SP-API) — Amazon's official, well-documented REST platform for orders, listings, inventory, FBA and settlement reports. AppsyOne builds a custom bridge between your own store and SP-API so orders drop straight into your systems, stock stays accurate, and you stop copy-pasting between Seller Central and a spreadsheet. It plugs directly into a custom appsy.one ecommerce solution rather than a rented dashboard.

Off-the-shelf aggregators can get you started, but their generic field mapping breaks down once your catalogue has variants, bundles, HSN codes and marketplace-specific pricing rules. We map your SKUs to Amazon ASINs the way your business actually works, push listings and price updates through the Listings and Product Pricing APIs, and pull orders and FBA fulfilment status back on a schedule you control. The logic lives in your integration, not behind someone else's paywall.

On Amazon your listing wins or loses at the ASIN level, so every SKU has to carry the right GTIN, condition and a Buy Box-eligible price before it can compete for the sale. We wire that logic into a build you own for a single flat fee — no slice of each Buy Box win, no per-order toll. Settlement reports from Seller Central reconcile against your books on their own, FBA and self-shipped FBM units stay counted apart, and Amazon reports up into the same stack your team already runs.

Large warehouse with tall pallet racking stacked with packed goods and a worker moving a pallet jack
Real-time inventory sync between your store and AmazonImage: Nick Saltmarsh via Openverse · CC BY

Amazon Custom Integration vs a SaaS Aggregator

When a plug-and-play tool is the smart call — and when a custom build you own pays off.

Consideration
Custom build (us)
SaaS aggregator
Plain catalogue, one Seller Central account
Overkill for a few standalone ASINs you fulfil yourself with no ERP behind them — we'll say so plainly.
A connector like CedCommerce or Codisto lists those SKUs faster, and for that scope it's the honest pick.
Mapping SKUs to ASINs, GTINs and variation themes
We match each SKU to the correct ASIN, carry its GTIN and condition, and model variation themes and bundles the way you actually sell them.
Generic templates flatten variations, so parent-child ASINs, GTIN exemptions and kit logic break or need hand-fixing.
Reconciling Seller Central settlements
Settlement reports post to your ERP or Tally with fees, refunds and reserves split out for GST-ready books.
Most panels stop at orders; matching Amazon's settlement deposits back to invoices is a premium add-on or missing entirely.
Splitting FBA and FBM stock as volume grows
FBA and self-shipped units stay counted apart under one flat fee, so a bigger GMV never inflates your bill.
Monthly tiers, order caps and sometimes a GMV cut mean your cost climbs with every strong Amazon month.

What We Sync With Amazon

Every system your orders, stock and money already flow through — connected.

Amazon SP-API (Orders)Amazon Listings & PricingFBA fulfilmentShopify Admin APIWooCommerce RESTYour ERP / TallyGST tax & HSN mappingShipRocket / DelhiverySettlement reconciliationGoogle Merchant Center
Interior aisle of a distribution warehouse lined with tall industrial shelving racks holding cartons
Central stock feeding every marketplaceImage: toolstop via Openverse · CC BY
Delivery driver at the wheel with cardboard parcel boxes and a paper bag on the passenger seat
Orders and shipping flow back automaticallyImage: The Bag N Box Man LTD via Openverse · CC BY

Official Amazon Resources

Straight from the source — Amazon’s own seller programme and developer documentation, the same primary references we build against.

Simple, Flat Integration Pricing

Custom-built marketplace integrations at a fixed one-time price. Pricing scales only with the number of integrations — never with your sales.

No transaction fees · No % of sales · No monthly lock-in · You own it

Starter

Get live on a single marketplace, synced to your store.

₹5,000one-time, flat
1 marketplace integration
Get Started
  • Connect your store to any 1 portal (Amazon, Flipkart, Meesho…)
  • Product catalog upload & mapping to the marketplace
  • Order sync into your store / dashboard
  • Inventory (stock count) sync one way
  • Custom-built on the official API — you own the code
  • No transaction fees · no % of sales · no monthly lock-in
Most Popular

Growth

Sell across several marketplaces from one source of truth.

₹25,000one-time, flat
Up to 3 marketplace integrations
Get Started
  • Everything in Starter, across up to 3 marketplaces
  • Single source-of-truth inventory — never oversell across channels
  • Unified order dashboard for all connected marketplaces
  • Two-way stock & price sync
  • Returns / RTO status pulled back into your store
  • Custom-built & owned — no transaction fees, ever

Pro

Full omnichannel: marketplaces + ERP/accounting + analytics.

₹35,000one-time, flat
Up to 5 marketplace integrations
Get Started
  • Everything in Growth, across up to 5 marketplaces
  • ERP / Tally / accounting sync (orders & invoices flow back)
  • Custom seller analytics — RTO %, commission-adjusted margins
  • Retry + error handling so nothing is lost when an API is down
  • Priority support & handover documentation
  • One flat fee — no per-order, per-lead or GMV-based charges

Need more than 5 marketplaces, a bespoke ERP bridge, or a custom seller portal? Talk to us for a custom quote.

Amazon Integration — Questions Sellers Ask

Common questions about our amazon integration solutions.

Ready to sell on Amazon?

Tell us which marketplaces you sell on. We'll build the integration on a flat, one-time fee — no commission on your sales, ever.

Get a Free Consultation