Marketplace integrations
One catalog, every marketplace, stock that stays correct
We connect your store or ERP to the marketplaces you sell on. Products, prices and stock go out from one place, orders come back in, and shipping and tracking flow both ways without copy-pasting between seller panels.
Who it's for
Clients usually come to us for marketplace integrations in one of these situations.
You sell on three panels and a spreadsheet
Each marketplace has its own admin panel, and someone on your team copies products, prices and order details between them every day.
Overselling and stock corrections
An item sells out on one channel but stays live on another, and you cancel orders or apologize to buyers because stock wasn't updated in time.
You want to open a new channel
You'd like to add Amazon, Etsy or a local marketplace, but listing the whole catalog by hand and keeping it current looks like a full-time job.
What we build
Selling on several marketplaces usually means several admin panels, spreadsheets and late-night stock corrections. An integration turns that into one source of truth with each channel kept in sync automatically.
- Product and listing sync
- Products, variants, images and descriptions published from your catalog to each marketplace, with category and attribute mapping for each channel's rules.
- Stock and price sync
- Stock levels and prices pushed to every channel when they change, with per-channel price rules and safety stock so you don't oversell.
- Order import
- Marketplace orders pulled into your store, ERP or warehouse system automatically, with customer, line item and tax details mapped to your fields.
- Shipping and tracking
- Cargo labels and tracking numbers sent back to the marketplace when an order ships, so status updates reach the buyer without manual entry.
- Returns and cancellations
- Cancellations and returns picked up from each channel, with stock released or restocked according to your rules.
- Integration dashboard
- One screen showing sync status per channel, failed listings with the marketplace's error message, and a log of every update sent.
How we approach it
Every request moves through the same steps, inside your weekly release cycle.
- 01
Channel and data review
We list the marketplaces you sell on, where your product and stock data lives today, and which steps your team does by hand.
- 02
Mapping
Categories, attributes, variants, shipping profiles and order statuses mapped for each channel and agreed with you before any code is written.
- 03
Build and test in sandbox
Each channel is built against the marketplace's official seller API, tested in its sandbox or with a small set of products first.
- 04
Gradual rollout
Channels go live one at a time, with sync logs and alerts watched closely during the first weeks.
Typical timeline
Engagement timeline
A typical first integration connecting one store to two marketplaces. Each additional channel usually takes two to three weeks.
About 6 weeks for two channels
Week 1
Channel and data review
Marketplaces, product data sources, order flow and manual steps listed.
Weeks 1 to 2
Field mapping
Categories, attributes, variants, shipping and order statuses mapped per channel.
Weeks 2 to 4
Product, stock and price sync
Listings published from your catalog, with stock and price updates on change.
Weeks 3 to 5
Order import and shipping
Orders flow into your system; tracking numbers flow back to the marketplace.
Weeks 4 to 5
Dashboard and alerts
Sync status, failed listings and error alerts in one screen.
Weeks 5 to 6
Rollout
Channels go live one at a time with close monitoring.
Timings depend on catalog size, how clean the product data is, and how long each marketplace takes to approve API access.
What you get every week
Releases happen on a fixed day each week. Monday starts with a queue check; Friday ends with these in your inbox and your shared channel.
Sync health report
Listings published, updated and rejected per channel this week, with the reasons for any rejections.
Stock accuracy check
A comparison of stock in your system against each marketplace, with any differences explained and fixed.
Release notes
New channels, mapping changes and fixes shipped in the weekly release.
Marketplace changes
API or policy changes announced by the marketplaces that affect your integration, and what we plan to do about them.
Quality standards
The targets we hold this work to, and how we check them. These are our commitments for how the work is done, not certifications.
- Stock updates
- Our targetStock changes are pushed to every connected channel on a schedule agreed per channel, typically within minutes.
- How we checkSync jobs are monitored and alert when a run fails or falls behind.
- Order import
- Our targetNo marketplace order is silently dropped: every failed import is retried and reported.
- How we checkA daily reconciliation compares marketplace orders with imported orders.
- API limits
- Our targetRequests stay within each marketplace's published rate limits, with backoff and retries.
- How we checkRate limit responses are logged and reviewed in the weekly report.
- Credentials
- Our targetMarketplace API keys are stored encrypted and scoped to the minimum permissions the integration needs.
- How we checkCredentials are listed in the access inventory and reviewed quarterly.
- Change safety
- Our targetMapping changes are tested on a small set of products before they apply to the full catalog.
- How we checkPart of the release checklist.
- Ownership
- Our targetIntegration code lives in your repository and runs in accounts you own.
- How we checkRepository and hosting access are confirmed at handover.
Typical deliverables
What you can expect to have in hand, in accounts and repositories you own.
- Channel and field mapping document
- Product, stock and price sync per marketplace
- Order import into your store, ERP or warehouse system
- Shipping and tracking updates back to each channel
- Integration dashboard with sync logs and error alerts
- Runbook for adding a new channel or product category
Illustrative example, not a client case study
Example engagement
A home goods brand adds two marketplaces to its own store
Imagine a brand selling about 800 products on its own Shopify store that wants to start selling on Trendyol and Amazon without hiring someone to manage listings by hand.
Week 1
Review and mapping
We map the store's collections and variant options to each marketplace's categories and required attributes, and flag products missing data such as barcodes.
Weeks 2 to 4
Listings and stock
Products are published to Trendyol first, starting with one collection, then the full catalog. Stock and prices update automatically when they change in Shopify.
Weeks 3 to 5
Orders and shipping
Marketplace orders appear in Shopify alongside web orders, and tracking numbers go back to each marketplace when the warehouse ships.
Weeks 5 to 6
Second channel
The same catalog goes live on Amazon using the mapping already in place, with the dashboard showing sync status for both channels.
Where it ends up
The team manages products and stock in one place, orders from every channel are fulfilled from one queue, and adding the next marketplace reuses most of the work already done.
Technologies we use
A short, well-known list. We'd rather know a few tools deeply than list every framework we've touched.
| Area | Tools |
|---|---|
| Marketplaces | Amazon Selling Partner API, eBay, Etsy, Walmart Marketplace, Trendyol, Hepsiburada, N11 |
| Store platforms | Shopify, WooCommerce, Custom Next.js stores |
| Integration | Node.js and TypeScript, Queues and scheduled jobs, Webhooks, PostgreSQL |
Which development plan fits
Marketplace integrations is delivered under a development subscription. These are the plans that suit this work best.
Starter
$390 per month, best fit
One marketplace connected to your store, with one request in progress at a time.
Start with StarterGrowth
$790 per month
Several channels built in parallel, with Papel Cloud hosting and Papel Monitor alerts for the sync jobs.
Start with GrowthScale
$1,490 per month
High-volume catalogs and many channels, with priority incident response when a sync fails.
Start with Scale
Marketplace seller accounts, API approval and any marketplace fees stay in your name. We are not an official partner of the marketplaces listed and work through their public seller APIs.
Compare all development plansCommon questions
If yours isn't here, ask us on a call or by email.
Which marketplaces can you connect?
Any marketplace with a seller API. The ones listed above are the most common requests. Tell us which channels you sell on and we'll confirm during the first review what each one allows.
Do we need to change our store platform?
No. We connect to the store, ERP or spreadsheet you use today. If there's no single source of product data yet, we help you choose one as part of the mapping step.
What happens if a marketplace rejects a listing?
The dashboard shows the rejected product with the marketplace's error message, and an alert is sent. Most rejections are missing attributes or category rules, which we fix in the mapping.
Who holds the marketplace API credentials?
You do. Seller accounts and API applications are created in your name, and we access them with the minimum permissions the integration needs. Credentials are stored encrypted.
What happens when a marketplace changes its API?
Marketplaces announce changes in advance. We track those announcements for the channels you use and schedule the updates as requests in your queue before the deadline.
Can you also build the store itself?
Yes. If you don't have an online store yet, we can build one as part of the same subscription and connect it to your marketplaces from the start.
Talk to an engineer about marketplace integrations.
A 30-minute call with an engineer, not a sales script. You'll leave with a scope, a plan recommendation and a start date.