Why can not I write off the goods when buying from "My Warehouse"?

Question

WordPress

Now the online store is being integrated with the My Warehouse platform, I connected the WooMS plugin, the product is added to the site, but when buying in the store, nothing is debited from the balance? Who faced can know what the problem is? I must say right away that I wrote to the developer, there was no answer. Maybe you also know similar solutions for an online store on woocommerce, for accounting for profits and balances.