A paid order on your Tienda Nube store comes in as an order to Commerce, discounts stock and notifies you. If it's cancelled there, the stock is restored here — nothing copied by hand.
Your store stays exactly as it is, same design, same URL. You just connect it.
A paid sale comes in as an order to Commerce and discounts from the same stock as your counter and your WhatsApp.
If the order is cancelled on the Tienda Nube side, the reserved stock is restored on its own.
Every Tienda Nube sale follows the same path as any other order: invoiced and collected with no double entry.