Ecommerce API integrations that connect your sales channels, fulfilment, and analytics into a coherent system.
We build ecommerce API integrations — multi-channel sync, 3PL connectivity, Shopify custom app development, ERP integrations, and the data pipelines that keep inventory, orders, and customer data consistent across systems. Fixed scope, fixed price.
You're selling on Shopify, Amazon, and wholesale EDI simultaneously. Inventory is out of sync. Orders are imported manually. You're overselling on one channel because another sold out and nobody updated the count. That's an API integration problem.
Multi-channel ecommerce brands run into the same operational problems as they scale. Inventory is the most common: a SKU that's available on Shopify, Amazon Seller Central, and a wholesale EDI channel simultaneously needs a single inventory number that decrements across all channels in real time. Without a centralised inventory layer and API sync to all channels, oversells are inevitable. The customer who ordered the out-of-stock unit and the 3-day delay and apology email that follows are the operational consequence.
Shopify's native multi-channel inventory handles the Shopify sales channels (online store, POS, social channels). It doesn't handle Amazon Seller Central, Faire wholesale, EDI retailers, or 3PL receiving. Those connections require custom API integrations — or manual reconciliation that doesn't scale past 1,000 orders per month.
The second common problem is order data flow. A brand selling across four channels needs all orders flowing into a single fulfilment queue — not a separate CSV download from each channel that someone manually imports into the 3PL portal every morning. Each channel's order format needs to be normalised and routed to the right fulfilment location based on SKU, shipping service level, and channel rules.
An ecommerce API integration layer that keeps inventory, orders, and customer data consistent across all your sales channels and fulfilment partners — eliminating oversells, manual data entry, and the 2-hour daily reconciliation your ops team does every morning.
Multi-channel inventory sync
Central inventory ledger that maintains the authoritative stock level per SKU per location. Inventory decrements pushed to Shopify, Amazon Seller Central, and other sales channel APIs when a sale occurs on any channel. Inventory replenishment (3PL receiving) updates the ledger and pushes available stock back to all channels.
Order routing and normalisation
Orders received from all channels (Shopify webhook, Amazon MWS, Faire API, EDI 850) normalised to a single order format. Routing rules (SKU, channel, shipping speed) determine which fulfilment location each order goes to. Fulfilment request pushed to 3PL API (ShipBob, ShipHero, or direct WMS API).
Shopify custom app development
Admin apps for internal tools embedded in the Shopify admin. Theme apps for customer-facing features. Checkout extensions for custom checkout steps. Public or private app delivery based on your use case.
Wholesale EDI integration
X12 EDI 850 (purchase order) receipt, 856 (advance ship notice) generation, and 810 (invoice) generation for wholesale retail partners who require EDI compliance (Target, Walmart, Nordstrom). VAN-based or direct SFTP exchange.
Analytics data pipeline
Order and inventory data from all channels pushed to a data warehouse (BigQuery or Postgres analytical schema) for cross-channel reporting: revenue by channel, return rate by SKU and channel, inventory turnover by category, and per-order margin. Built on Next.js API routes, Postgres, Shopify Admin API, Amazon SP-API, 3PL API integrations, and EDI VAN.
One honest number to start.
Fixed-scope, fixed-price. The number below is the starting point — final scope is built from your brief.
An ecommerce API integration layer that keeps inventory, orders, and customer data consistent across all your sales channels and fulfilment partners — eliminating oversells, manual data entry, and the 2-hour daily reconciliation your ops team does every morning.
Three steps, every time.
The same repeatable engagement on every project. No surprises, no mystery, no billable ambiguity.
Brief & discovery.
We send you questions, then get on a call. Output: a written scope with every step, feature, and integration listed.
Build & ship.
Fixed schedule, weekly reviews. No scope creep unless you change the scope — and if you do, we reprice it transparently.
Warranty & retainer.
30-day warranty on every launch. Most clients stay on a monthly retainer for ongoing features and maintenance.
Why Fixed-Price Matters Here
Ecommerce brands need API integrations completed before a specific peak period — a product launch, a wholesale partnership start, a Black Friday. Fixed scope and fixed price with a defined delivery date is how you plan the integration against a business calendar rather than waiting indefinitely.
Questions, answered.
We build the sync with idempotent webhook processing and sub-60-second propagation from the triggering sale to all channels. For channels where API update latency allows it, real-time sync is maintained. For slower APIs (some Amazon endpoints), we supplement webhook sync with a periodic reconciliation pass.
Bundle inventory sync requires component-level inventory tracking — when a bundle sells, each component's available inventory decrements, and the bundle's available inventory across all channels updates accordingly. This is a specific scope item; we handle it correctly in the integration design.
EDI chargebacks from retailers are almost always compliance failures — incorrect labelling, wrong pack quantities, or late ASN submissions. We configure the 856 ASN generation to trigger at the right time in the fulfilment workflow and validate against the retailer's trading partner specs to minimise chargeback exposure.
Multi-channel inventory sync, order routing, Shopify custom app, and wholesale EDI typically runs $35k–$75k. The number of sales channels and EDI trading partners are the main variables. Fixed-price.
10 to 14 weeks for a production ecommerce integration layer with multi-channel sync operational.
Tell Ryel about your project.
Describe what you’re building and what outcome you need. You’ll have a written, fixed-price scope within the week.