Trendyol is Turkey's largest e-commerce marketplace. A new brand's first orders usually come from here rather than from its own website. This guide covers the seller onboarding process, the commission structure and the part that really matters — integration.
Trendyol seller requirements
What you need to apply:
- A company or sole proprietorship (you must be registered for tax in Turkey)
- Tax registration certificate (vergi levhası — the document issued by the Turkish tax office)
- Authorised signatory list or signature declaration (imza sirküleri / imza beyannamesi — the notarised document showing who can sign for the business)
- Bank account details (IBAN) in the company's name
- Contact details and a warehouse/returns address
- If you sell a brand: a trademark registration certificate or letter of authorisation
Approval usually takes a few business days. In categories that require trademark registration (cosmetics, electronic accessories, clothing brands), missing documents are the most common reason for rejection.
Commission rates and the real cost
| Category | Commission range |
|---|---|
| Electronics | 8–12% |
| Fashion and clothing | 15–20% |
| Home and living | 12–18% |
| Cosmetics | 15–20% |
| Books, stationery | 10–15% |
Rates vary by category and seasonal campaigns; check the current list in the seller panel.
Commission isn't the only item in your profit calculation. The real cost is the sum of:
- Commission: On the sale amount
- Shipping: Contracted rates, paid by the seller in most categories
- Returns: The return rate can reach 20–30% in fashion; return shipping is a cost too
- Campaign participation: The discount is funded by the seller
- Advertising: To appear near the top of your category
Pricing without adding these up leads to a picture where revenue grows while profit melts away. Practical rule: add at least 10 more points on top of the category commission when calculating your margin.
Product listings
Three things determine visibility on Trendyol: the product title, image quality and seller rating.
- Title: Brand + product type + distinguishing feature. Keyword stuffing backfires.
- Images: White background, at least 1,200 pixels, the product alone in the first image.
- Variants: Colour and size variants should be grouped under one product; listing them separately splits the reviews.
- Category: The wrong category affects both commission and visibility.
API integration: this is the real issue
When you sell through one channel, managing things by hand works. The moment you open a second channel it doesn't — because the same stock is kept separately in two places and you start selling products you no longer have.
Flows you can build with the Trendyol API:
- Product and price export: From your central system to Trendyol
- Stock synchronisation: From one hub to all channels
- Order import: Trendyol orders into your own panel
- Shipping and invoicing: Barcode generation and the e-Archive invoice flow (e-Arşiv fatura, Turkey's mandatory electronic invoice for consumer sales)
- Returns management: Central tracking of return requests
The critical synchronisation decision
Which system holds the "true" stock? This question needs one answer — usually the accounting or warehouse system. All other channels are fed from there. Setting up two-way sync without defining which system tells the truth is the most common mistake that keeps corrupting stock data.
Price differentiation
Because you pay commission on the marketplace, selling a product at the same price as on your own site eats your margin. The integration needs to support channel-based pricing rules: one price for your own site, and a price with the commission added for the marketplace.
Off-the-shelf integration or custom development?
Ready-made solutions are enough for standard scenarios: one warehouse, standard pricing, one marketplace, a common e-commerce platform.
Custom development is needed when you have:
- More than one warehouse and warehouse-level stock
- Channel-specific pricing and campaign rules
- A connection to an ERP or custom accounting system
- Dealer/wholesale price lists that must work alongside
- Three or more marketplaces
On cost: ready-made solutions are subscriptions in the 500–3,000 TL per month range; a custom integration is a one-off investment of 25,000–80,000 TL. The break-even point is usually the second year and the third channel.
Common mistakes
- Keeping the stock sync interval too long (over 15 minutes is risky)
- Having no notification mechanism for errors — an order that fails to transfer goes unnoticed
- Leaving the Trendyol price the same as on your own site
- Not accounting for the return rate
- Depending on a single channel: if your Trendyol account is suspended, sales drop to zero
The last item is the strategic one. The marketplace is your volume channel; your own site is the commission-free channel that belongs to you. The two should run together.
Frequently Asked Questions
How long does the integration take?
3–5 weeks for a standard order + stock flow. 6–10 weeks if there's an ERP connection and multiple warehouses.
Is Trendyol enough if I don't have my own website?
It's enough to start with, but customers become Trendyol's customers, not yours. To build a brand and sell without commission you need your own site. We explain the setup steps on our e-commerce website page.
Can Hepsiburada and N11 be added too?
Yes. In a well-designed integration architecture, adding a second and third marketplace (Hepsiburada and N11 are Turkey's other major marketplaces) is much faster than the first.
How does invoicing work?
e-Archive invoicing is mandatory. The integration should issue the invoice automatically when the order is completed and pass it on to accounting.
To get set up
Tell us about your current system, your number of warehouses and the channels you want to connect; we'll scope it for free. You'll find the service details on our Trendyol integration page and the general approach on our API integration page.
Phone / WhatsApp: +90 536 628 0007
Email: info@enextware.com
