The simple way to connect your existing store to several marketplaces and manage stock, orders and shipping from a single panel.
Updated: June 2026
Marketplace integration is the connection that lets you link your existing e-commerce store to marketplaces like Trendyol, Hepsiburada or Amazon and manage your products, stock, orders and shipping processes from a single place. The key word here is "connecting": this is not about building a new store, but about getting the store you already sell from to talk to additional sales channels. If you have not set up your store yet, you need to open it first; this guide covers connecting an existing store to marketplaces. Below you will find, in plain language, what marketplace integration is, why managing everything from a single panel matters, how it is done, how stock, order and shipping sync work with concrete examples, what to watch out for such as overselling, and what determines the cost.
Marketplace integration is an automatic bridge built between your own store and a marketplace. Thanks to this bridge, you define a product in one place and it appears on every connected marketplace; when a sale happens, the order drops into your main system automatically and stock updates across all channels at the same time. A concrete example: you have 10 units of a product in your warehouse and you have listed it on both Trendyol and Hepsiburada. Without integration, you would have to track stock by hand on each platform. With integration, when one unit sells on Trendyol the stock automatically drops to 9 and shows as 9 on Hepsiburada at the same moment. So integration is the technical link that connects scattered channels to a single source of truth.
Selling on several marketplaces is one of the fastest ways to reach customers, but managing each channel separately quickly becomes tiring and error-prone. Every platform has its own panel, its own order screen and its own stock area; doing the same work in three different places takes time and creates inconsistency. The single-panel logic removes this fragmentation: you define a product once, enter stock once and see all orders on a single screen. For example, instead of opening three different sites in the morning to check orders one by one, you see them all in one list and hand them over to shipping from one place. This is not just convenience; it is what keeps the operation sustainable at the point where manual tracking becomes impossible as sales grow.
Integration consists of a few basic steps. First you clarify which marketplaces you will connect and how your store's infrastructure is built; it must be clear which products you will sell on which platform. Next the connection between your store and the marketplace is established: this link is usually made through an integration interface provided by the marketplace, by configuring your store infrastructure to talk to that interface. Then comes product matching: it must be defined that a product on your side and its counterpart on the marketplace are the same product, and categories and attributes must be placed correctly; if this matching is wrong, stock and orders flow wrong too. Finally the sync rules are set: in which direction and how often stock, price and order information is updated. With a correctly set up integration, the daily work after these steps comes down to managing products and orders from a single panel.
The heart of integration is sync: the automatic and consistent updating of three flows across channels. Stock sync ensures that a sale on one channel instantly lowers stock on all other channels, so you do not accidentally sell a product you do not have. Order sync gathers all orders onto a single screen no matter which marketplace they come from; for example, two orders from Trendyol and Amazon appear side by side in the same list. Shipping sync, in turn, connects the dispatch process: when you hand an order over to the carrier, the tracking code is sent automatically to the relevant marketplace and the customer is informed. The diagram below shows how these three flows move from different marketplaces into a single panel.
A sale on one channel instantly lowers stock across all channels; the risk of selling a product you do not have disappears.
No matter which marketplace they come from, all orders appear side by side on a single screen and are handled from one place.
When you hand the order over to the carrier, the tracking code is sent automatically to the relevant marketplace and the customer is informed.
The most common problem is overselling: when stock sync is not set up correctly, the same product is sold on two different marketplaces at the same time and you are forced to fulfil an order whose stock you do not have. The way to prevent this is to make sure stock updates flow fast enough and from a single source of truth. The second point is product matching: a mismatched product can lead to the wrong product reaching the customer. Third, every marketplace has its own rules and commission structure; a practice allowed on one channel may cause problems on another. There is also an important distinction: this guide covers connecting an existing store to marketplaces; if you do not yet have a store to sell from, you should first take a look at our guide on creating an online store, because without a source store for the integration to connect to, sync is meaningless.
There is no fixed "marketplace integration price"; the cost is shaped by several factors. First, the number of channels: connecting to a single marketplace is a different scope from managing four or five marketplaces at once. Second, the number and variety of products: a catalogue of a few products requires a different amount of effort in matching and sync than a catalogue with thousands of variants. Third, the scope of the integration: will only stock be matched, or will price, orders and shipping be connected too — the wider the scope, the bigger the work. It also matters how ready your store infrastructure is for this connection; an infrastructure with a ready integration interface is not the same as one that requires custom development. A realistic cost emerges not from a ready-made list but as these factors become clear; as you define how many channels, how many products and which flows you will connect, the budget becomes predictable too.
Yes. Integration connects an existing store to marketplaces; without a source store for it to connect to, stock and order sync are meaningless. If you do not have a store yet, the right order is to create your online store first and then open up to marketplaces through integration.
A correctly set up stock sync prevents this: a sale on one channel updates stock across all channels instantly and from a single source of truth. For example, when one unit sells on Trendyol, the stock on Hepsiburada drops at the same time. The real cause of confusion is sync that is slow or fed from multiple sources; that is why setting a single source of truth for stock is critical.
Overselling means a product you do not have is sold on two channels at the same time due to a delay in stock sync; as a result you cannot fulfil the order and you face customer dissatisfaction and cancellations. The way to prevent it is to make stock updates fast enough and have all channels follow a single source of truth for stock.
The cost is not fixed; it depends on factors such as the number of channels to connect, the number and variety of products, the scope of the integration (only stock, or price, orders and shipping too) and how ready your store infrastructure is for this connection. A clear budget emerges once you have defined how many channels and which flows you will connect.
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