List once, sync everywhere:
without manually updating five marketplaces by hand

What it is

A marketplace integration is the sync engine that takes one catalogue, your actual products, prices, and stock, and keeps it correctly reflected across every marketplace you sell on, pulling orders back into one place instead of logging into five different seller dashboards every day. Each marketplace, Shopee, Lazada, TikTok Shop, Amazon, Ozon, has its own API, its own required data format, and its own rate limits, which is why “just sync everything” is actually a meaningful engineering problem rather than a simple export.

We built exactly this for our own digital goods business: a normalized catalogue across nineteen regions, over a hundred and seventy thousand regional prices, and over twenty-five thousand listings prepared for two marketplaces by one pricing engine, with a margin guard verified against 864 real orders at zero sold below cost.

When you need it (and when you do not)

You need this once you sell on more than one marketplace and price or stock updates currently require touching each platform separately, which is both slow and a frequent source of the exact kind of error that leads to overselling or a price shown wrong on one platform after an update elsewhere. It becomes essential once you are considering adding a third or fourth marketplace, since the manual-update approach gets dramatically worse with each platform added, not just linearly worse.

You do not need this if you sell on a single marketplace, or if your catalogue is small enough, under a few dozen SKUs, that manual updates across two platforms genuinely remain manageable. We will say so if your actual volume does not justify the build yet.

How we build it (stack, components, integrations)

One catalogue in PostgreSQL holds the canonical product data, and a connector per marketplace translates that data into each platform’s specific required format, category mapping, required attributes, image specifications, which differ meaningfully between Shopee and Amazon, for instance. Every connector respects its marketplace’s documented rate limits with queuing and backoff, because exceeding a marketplace’s rate limit risks account suspension, a risk we design against explicitly rather than treating as an edge case.

Orders from every connected marketplace flow into one order queue, feeding into whatever order management or fulfillment system you already run, so your team works from one list instead of five separate seller dashboards. A margin check runs per platform before any price syncs out, because each marketplace takes a different commission and fee structure, and a price that is profitable on one platform can be a loss on another at the same listed price.

What to watch (risks, cost of ownership, vendor lock-in)

Marketplace APIs change their rate limits, required fields, and authentication methods without much warning, and an integration that is never revisited will eventually break on one platform while working fine on the others, which is easy to miss if monitoring is not in place. The other real risk is account suspension from an API usage pattern a marketplace’s systems flag as abusive; this is exactly why rate limiting and backoff are built in from day one, not added after a warning email arrives.

Price and timeline

Running cost is usually $30 to $90 a month in hosting plus each marketplace’s own commission on sales, unchanged by this system.

Related

This pairs with digital goods store with instant delivery for sellers whose fulfillment also needs to be automated, and with marketplace seller tools for managing your own seller-side operations once synced. See the e-commerce service page for package details. For real multi-marketplace automation at scale, see the digital goods marketplace automation case study and the ProBay marketplace case study.

Logging into five seller dashboards to update the same price change? Get in touch and we will look at which marketplaces you actually need synced.