---
title: "Marketplace integration and stock sync: how to set it up"
author: "Performetic Ekibi"
url: "https://www.performetic.com/en/blog/marketplace-integration-stock-sync-setup"
published: "2026-11-04T06:00:00.000Z"
updated: "2026-11-04T06:00:06.588Z"
---

# Marketplace integration and stock sync: how to set it up

> A marketplace integration moves product, stock, price and order data from one master system to channels such as Trendyol and Hepsiburada automatically. To set it up well, pick a single source of truth for stock, match products by barcode and SKU, add a stock buffer per channel and check the sync logs daily for the first two weeks.

## How do you set up marketplace integration and stock sync?

A marketplace integration moves product, stock, price and order data from one master system to Trendyol, Hepsiburada and other channels automatically. Setup comes down to four moves: pick a single source of truth for stock, match products by barcode and SKU, set a stock buffer per channel, and watch the sync logs closely in the first weeks.

This isn't an API manual. It's a setup plan for brands that run their own store plus two or three marketplaces and are tired of updating stock in spreadsheets or by hand. Whether you should grow on marketplaces or on your own site is a separate question, covered in our post on [marketplace vs your own store](/en/blog/marketplace-vs-own-online-store). Here we assume you run both.

## What does a marketplace integration actually sync?

A well-built integration handles four data flows. Each one runs in a different direction, and most confusion comes from those directions not being clear.

| Data | Direction | How often | What goes wrong if it fails |
|---|---|---|---|
| Product content (title, images, attributes) | Master system to marketplace | When a product is added or edited | Listing rejected or shown in the wrong category |
| Stock quantity | Master system to marketplace | After every sale, as fast as possible | Overselling, cancellations, seller score damage |
| Price | Master system to marketplace | On promotions and price changes | Selling at a loss or pricing yourself out |
| Orders and shipping | Marketplace to master, tracking number back | When an order lands | Late shipments, wrong invoices |

Trendyol's developer documentation describes the scope the same way: product transfer, stock and price updates, order processing, invoice submission and answering customer questions. One note: Trendyol has announced that its old V1 services will be switched off as of October 15, 2026, and integrations need to move to the Product V2 and Order V2 services. If you're connected through your own code or an older integrator, ask about this now.

## Which integration method fits your store?

In Turkey there are three common routes. The right one depends on your SKU count, the number of channels and how technical your team is.

**Your platform's built-in module.** Platforms such as ikas and Ticimax offer marketplace integration inside their own admin. According to ikas, orders and stock for Trendyol, Hepsiburada, Amazon and Etsy can be kept in sync with ikas, with Trendyol and Hepsiburada included in specific plans. Ticimax lists a long set of domestic and international marketplaces and says you can send each marketplace a lower stock figure than your main stock, or a different price. One panel and one support contact. The downside: if you change platforms, you rebuild the integration.

**A standalone integrator.** Tools that sit apart from the store and the marketplaces and hold stock centrally. They make sense if you run several stores, a physical shop or multiple warehouses. They also add another system, another subscription and another point of failure.

**ERP or custom software.** If accounting and warehousing already live in an ERP, the ERP becomes the stock master and everything else feeds from it. It's the most robust setup and also the slowest to build.

On Shopify, Turkish marketplaces usually need a local app or integrator. Before choosing, check what your current platform supports natively. Often the problem isn't a missing integration but a half-configured one.

## How do you set up a marketplace integration step by step?

A mistake we see often: the integration is switched on after a week of rushed work, and the first big sale weekend brings a wave of oversold orders. Follow this order instead:

1. **Choose one source of truth for stock.** The store, the ERP or the integrator. Stock changes only there; manual edits in marketplace panels are off-limits.
2. **Clean up product codes.** Every variant needs a unique SKU and barcode. The same barcode on two products is the most common cause of mismatches.
3. **Map categories and attributes.** Marketplaces require attributes like colour, size and material. Doing this properly once saves a rejection on every new product.
4. **Set a stock buffer per channel.** Example: with 10 units in the warehouse, sending 8 to a marketplace lowers the risk of simultaneous orders overselling.
5. **Define a pricing rule.** Decide whether commission is built into marketplace prices. Example: a product priced at 1,000 TL on your site might carry a different marketplace price to cover commission; write the rule into the integration, not into someone's head.
6. **Test with a small product group.** Start with 10 to 20 products, place a test order, and run a cancellation and a return through the flow.
7. **Monitor the sync logs.** For the first two weeks, check error logs daily. List the products that fail and fix the root cause.

## How fast does stock sync need to be?

The theoretical answer is instantly. In practice, integrations update on intervals or on events, and marketplaces need their own processing time. So the real question isn't speed but whether you're protected against the lag.

For low-stock products, a buffer, reserving the last few units for one channel and turning on stock alerts during promotions all soften that lag. You also need to manage ad spend when an item is about to sell out; we cover that in our guide on [managing ads when stock is low](/en/blog/managing-ads-when-stock-is-low).

## Why does overselling happen, and how do you prevent it?

The causes are usually the same:

- The same item sells on two channels at nearly the same moment, inside the sync delay
- Someone edits stock by hand in a marketplace panel
- A returned item goes back on the shelf but never into the system
- Variants are mismatched, so size S stock lands on size M
- Physical store sales reach the system late

The fix isn't a single setting. It's discipline: one source, clean codes, buffers and regular log checks. Marketplaces factor cancellation rates into seller performance, so an oversell costs more than one lost order.

## How does marketplace integration affect ads and profit?

Accurate stock isn't only an operations issue. Spending on ads for products that are out of stock is one of the most common budget leaks we see in Google Shopping and Meta catalog ads. When the store and marketplaces draw from the same stock, your product feed carries the right availability too, and ads stop on sold-out items by themselves.

Pricing works the same way. If commission, shipping and returns aren't built into your pricing rule, marketplace sales look large as revenue and small as profit.

## What should you ask an integration provider?

- Do you support the current API versions of the marketplaces I use?
- How often, or on what event, are stock updates triggered?
- Can I set a stock buffer and a different price per channel?
- Can I see error logs in the panel, and do I get alerts?
- Are e-invoices and tracking numbers sent to the marketplace automatically?
- Can I export my product mappings if I leave?

If you need help on the platform and integration side, our [sales infrastructure service](/en/services/sales-infrastructure) explains how we work on ikas, Ticimax and WooCommerce projects. If you'd like to see where stock, feeds and ads are leaking money in your current setup, you can ask Performetic for a [free growth audit](/en/contact).

## Key takeaways

- A marketplace integration moves product, stock, price and order data from one master system; each flow needs a clear direction.
- Pick one source of truth for stock and stop editing stock by hand in marketplace panels.
- Clean barcodes and SKUs prevent most mapping errors before they happen.
- A per-channel stock buffer reduces overselling caused by sync delays.
- Trendyol's V1 services shut down as of October 15, 2026; confirm your integrator supports V2.
- Accurate stock also stops ads from spending on sold-out products.

## FAQ

### What is a marketplace integration?

A marketplace integration is a software connection that sends product content, stock, prices and orders from one master system to marketplaces such as Trendyol and Hepsiburada automatically. It can run through your ecommerce platform's own module, a standalone integrator or an ERP. The goal is to remove manual updates and stop overselling.

### How do I sync stock between Trendyol and Hepsiburada?

Choose one system as the source of truth for stock, then match every variant to its marketplace listing using a unique barcode and SKU. Stock should change only in the master system, and the integration pushes each change to both marketplaces. For low-stock items, a per-channel buffer reduces the risk of overselling during sync delays.

### How can I prevent overselling across channels?

Prevent overselling with one source of stock, clean product codes, stock buffers and regular checks of the sync error logs. Avoid editing stock by hand in marketplace panels, record returns in the system and push physical store sales without delay. During big promotions, watch low-stock products separately.

### Do I need a separate integrator if I use ikas or Ticimax?

Often not. Both ikas and Ticimax offer marketplace integrations inside their own admin, so check which marketplaces your plan includes. If you manage several stores, warehouses or an ERP, a standalone integrator that holds stock centrally can give you more flexibility, at the cost of one more system to maintain.

## Sources

- [Trendyol Developers: integration documentation](https://developers.trendyol.com/)
- [ikas: Marketplace integrations](https://ikas.com/tr/pazaryeri-entegrasyonlari)
- [Ticimax: Ecommerce marketplace integrations](https://www.ticimax.com/e-ticaret-pazaryeri-entegrasyonlari/)