When you join shocking sales or big campaigns via the marketplace seller center, you can set Reserve Stock in Zetpy. Then, Zetpy will sync the available stock across multiple channels - marketplaces (Shopee & Lazada) & online stores (Shopify & WooCommerce).
Foremostly, we want to share that it is not possible to 100% guarantee to prevent overselling issues. Zetpy could only help to reduce overselling as much as possible towards 99%. This is because there are many external factors that may cause overselling issues to happen.