The store says twelve in stock, the shelf says nine, and the difference is three angry refunds. Knowledge ERP syncs products, inventory levels, orders and fulfilments two ways with Shopify and WooCommerce, so the storefront and the shelf agree.
How the numbers drift apart
A storefront tracks what it has sold. It does not know about the unit that got damaged in the stockroom, the one you sent as a replacement, the two that went out to a wholesale customer over the phone, or the box that was miscounted when the container landed.
Every one of those is a quiet decrement that the store never sees, and they accumulate. By the time the gap is big enough to notice, it shows up as an oversell: someone paid for something you do not have, and you get to choose between a refund and a apology email.
The fix is not counting more often. It is having one place where stock is decided, and having the storefront read from it rather than keep its own opinion.
What the sync actually covers
- Products and inventory levels, both directions
- Orders flowing in as sales orders, fulfilments flowing back with tracking
- ShipStation for label-and-ship, pulling tracking into the order
- QuickBooks Online for the money side, which stays your system of record
Behind the sync you get the parts ecommerce platforms skimp on: reorder points and suggestions so bestsellers do not stock out, receiving against purchase orders when the container lands, cycle counts that catch shrinkage early, and lot tracking with expiry for consumables. Multiple warehouses are locations with their own bins and counts.
Which system owns the number
This is the question worth settling before you connect anything, and most integrations are vague about it.
Stock levels are owned here. Knowledge ERP holds the count, and the storefront is told what it is. That is the direction that makes sense, because this is where receiving, transfers, damage, counts and wholesale orders all land, and the storefront only ever sees one of those.
Orders go the other way. The store owns the order, it arrives here as a sales order, and fulfilment and tracking flow back out. Product data can go either direction depending on where you prefer to do the editing, and that is a setting rather than an assumption.
The practical consequence: once this is connected, stop adjusting stock in the storefront admin. Adjustments made there get overwritten by the next sync, which looks like a bug and is actually the system doing what you asked.
Selling in several places at once
Multi-channel is where a single source of stock stops being a nice idea and starts being the only workable arrangement. Two storefronts each keeping their own count will oversell, because neither knows what the other sold.
Locations map to real warehouses with their own bins and counts, so you can hold stock back for wholesale, keep a retail location separate, or fulfil from whichever site is closest.
Two kinds of customer, one stock pool
Wholesale usually arrives before anyone plans for it. Someone asks for forty at a better price, and now there is a spreadsheet next to the storefront.
The Sales module adds quotes, price lists with per-customer pricing, and invoicing with online payment, drawing on the same stock the store sells from. Field operations and equipment check-out work the same way if you also loan or demo product.