Stock sync across marketplaces: how to stop overselling when you sell on multiple platforms
Selling on Shopee and Lazada at the same time but your stock keeps getting out of sync? That is overselling. This guide explains exactly how real-time stock sync works and why every multi-channel Thai seller needs it.
What is overselling and what causes it
Overselling happens when you sell more units than you have in stock. It occurs when customers from Shopee and Lazada both order the same item at the same time, but inventory has not updated in real-time. Both orders go through but only one unit exists. Result: cancellations, damaged seller ratings, and disappointed customers.
How real-time stock sync works
Real-time stock sync connects directly to each marketplace API. When an order is confirmed on any channel, the system deducts stock instantly and pushes the update to every connected channel. This happens within seconds, before another customer on a different platform can order the same unit.
How Seller Pao syncs stock across platforms
Seller Pao connects to Shopee Thailand, Lazada Thailand, TikTok Shop Thailand, Facebook, and LINE OA via official APIs. When an order arrives from any channel, the system deducts stock and updates every channel instantly. The same SKU can be listed across multiple platforms with no overselling risk.
Supported channels and features
Supports Shopee, Lazada, TikTok Shop, Facebook, and LINE OA with real-time sync across all channels. Handles SKUs and variants. Supports multiple warehouse locations. Low-stock alerts and per-channel inventory reports included.
Which stores need this
Essential for stores selling the same products across multiple marketplaces, with many SKUs, and any history of overselling or stock discrepancies. If you sell on one channel at low volume, manual updates are still manageable. Once you go multi-channel, automated sync is not optional.
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What is overselling and how does it affect my store?
Overselling is selling more stock than you have. Orders from multiple channels arrive simultaneously but inventory has not updated yet. The result is forced cancellations, unhappy customers, and drops in your marketplace seller rating.
What is the difference between real-time sync and scheduled sync?
Real-time sync updates stock the moment each order is confirmed. Scheduled sync updates on a timer, say every 15 minutes. During that gap, overselling can still happen. Seller Pao uses real-time sync to eliminate this risk.
Does Seller Pao handle SKUs and product variations?
Yes. Products with multiple variations, such as shirts in different colors and sizes, have each SKU tracked separately. If red shirt size M sells out, only that SKU locks. Other variants remain active.
What happens if my internet drops during an order?
The system is designed to handle connectivity interruptions. When the connection restores, pending orders sync automatically. No orders are lost.
Can I manage inventory across multiple warehouse locations?
Yes. Seller Pao supports multiple warehouse locations. You can configure which platform pulls stock from which warehouse, useful for stores with a main warehouse and a branch location.
My system stock and physical stock do not match. How do I fix this?
Perform a stock count in the system and adjust to match physical inventory. This is done easily through the Inventory Management page. The system keeps a history of all stock adjustments for audit purposes.