E-commerce ops, in plain language.
From Trendyol commission reports to multi-warehouse inventory, from abandoned carts to multi-channel strategy — practical writing distilled from 4,200+ Karum brands' operations. New content every week.
Long-read from the field.
Real profit margins on Trendyol: commission, return shipping, and packaging fees explained
The Trendyol dashboard shows 19% commission, but real profit emerges after adding return shipping, per-package fees, and per-item fees. Data we collected over 3 months from a 240-SKU brand and how Karum's P&L report extracts this number in seconds.
Filter posts by topic — 9 categories, 124 posts.
Your first marketplace pick: Trendyol or Hepsiburada first?
If you're starting out, picking one marketplace first is the right call. Category-level performance data: textile/accessories on Trendyol, electronics/home on Hepsiburada — why, and when exceptions apply.
Multi-warehouse fulfillment: routing each order to the nearest warehouse
In a two-warehouse brand, deciding which warehouse ships each order can take 5 minutes manually. How Karum's smart routing rules make this decision in milliseconds — city-level courier ETAs and stock-shortage fallback logic.
We cut return rate below 5%: 3 small operational changes
A Karum customer dropped return rate from 12% to 4.8% in 9 months. Three things changed: size chart in product description, natural-light product photos, and bubble wrap in the shipping box.
Recovering abandoned carts: 22% conversion with a 3-email trigger flow
Cart abandonment is a universal pain. Karum's automated 3-email series: 1-hour reminder, 24-hour mild discount, 72-hour last-chance. With open and conversion rates broken down.
Aras vs Yurtiçi vs MNG: regional performance benchmark (2026 Q1)
What happens when you ship the same package via 3 couriers simultaneously? 30-day measurement across 12 regions: which courier wins which city, who loses the most packages, east-west gap.
Preparing for year-end campaigns a month ahead: 14-point checklist
What brands doing 4x year-end revenue actually do: 14 things. Stock buildup, campaign planning, courier deals, and team shifts — a detailed roadmap for a November where ops don't break.
One store, four marketplaces: managing without scaling the ops team
Atölye 33 grew revenue 6.4x while keeping its ops team at 2 people. The key: single-panel multi-marketplace management, automated invoicing, and smart fulfillment routing.
Karum webhook idempotency: don't fear receiving the same event twice
Karum webhooks deliver with at-least-once guarantee. This post covers HMAC signature verification, idempotency key usage, and duplicate event handling patterns — with Node.js and Python examples.
Turkey e-commerce quarterly: 2026 Q1 trends and data
Anonymized data from Karum's 4,200+ stores: category-level growth, average basket, mobile vs desktop split, marketplace vs own-site share, and regional differences.
Advanced Karum theme editor: 8 small details, big difference
You opened the theme editor, picked colors, but something still feels off? 8 fine-tunes: hero image ratio, product card hover, sticky nav, breadcrumb spacing, footer column balance.
VAT automation: setting up e-invoice flow with zero errors
The way to avoid e-invoice penalties is per-order automated invoicing. Karum's GİB, Paraşüt, Logo, and Mikro integrations, VAT rate rules, and customer tax-type detection logic.
Karum AI product copy: SEO-friendly text in 30 seconds
Writing copy for 240 SKUs takes 4 weeks. Karum AI learns from product attributes and similar items to produce SEO-friendly, fluent Turkish copy in 30 seconds. Three brand examples and conversion lift.
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This month's five most-read posts.
Posts where Karum readers spent the most time, saved the most, and shared the most — let your starting point be here.
- 01
Real profit margins on Trendyol: commission, return shipping, and packaging fees explained
Marketplace
- 02
Multi-warehouse fulfillment: routing each order to the nearest warehouse
Inventory
- 03
Aras vs Yurtiçi vs MNG: regional performance benchmark (2026 Q1)
Operations
- 04
Recovering abandoned carts: 22% conversion with a 3-email trigger flow
Marketing
- 05
One store, four marketplaces: managing without scaling the ops team
E-commerce
Karum blog authors — from the field.
All our blog authors hold active Karum roles: operations, product, developer relations, customer success. Behind each post is the real data of 4,200+ stores.
Duygu Karaca
Marketplace strategy · Product manager · 6 yrs e-commerce
Ali Tekin
Operations & logistics · Courier integration architect · 8 yrs field
Merve Şahin
Customer experience · Customer success lead · 5 yrs SaaS
Mert Erdem
Marketing automation · Growth PM · 7 yrs
Kerem Uğur
Developer platform · DX team lead · 9 yrs backend
Elif Çelik
Industry analysis · BI product manager · 4 yrs analytics
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