POS website integration: connecting your register to your online store

An integration can cover any of these five jobs.

• Inventory. The website shows what the register says is in stock, so you don't sell what's gone.
• Orders. Every online order reaches the person who packs it, with a packing slip they can work from.
• Dropship routing. Items a supplier ships for you go to that supplier automatically, so nobody forwards emails by hand.
• Pickup. A customer buys online and collects in the shop or at an event.
• Event point of sale. Sales at a pop-up, show or conference land in the same system as online sales.

This is the first question to answer, because everything else depends on it.

One way, register to website. The gift and coffee shop's register holds the stock, and the website reads it. Every morning at 6am a scheduled job reads the full point-of-sale inventory, matches it to the products on the website, and updates stock and status, about 1,880 products on each run (case study). Online sales are entered into the register each evening. Before the job writes anything, it holds back any item that sold online but hasn't been entered at the register yet, so an online sale is never overwritten. The details of that build are on Quantic POS and WooCommerce.

Both ways. Some POS systems have a connector that moves stock in both directions. The Lightspeed POS for WooCommerce extension, for example, lowers WooCommerce stock when something sells in the store and lowers Lightspeed stock when something sells online (WooCommerce Marketplace).

Whichever way it runs, pick one system as the source of truth for counts. On the gift shop build, the register is that system, and the website never writes its own stock decrease, because the next morning's read would overwrite it.

On the gift and coffee shop's store, order emails send from the shop's own mailbox, and packing slips print with the item number on every line. Two wholesalers ship direct to customers: a home-and-gift wholesaler with 347 items, live September 4, 2026, and a home-textiles wholesaler with 93 products, live October 1, 2026. Orders for those items email each supplier automatically, and stock for the first one updates from the supplier's own sheet (case study).

For Califia Farms, orders go to a fulfillment warehouse. We built an internal store with a zero-dollar checkout so sales representatives could order trade-show materials, with each order passed to the warehouse and contractor (our work).

Jen Schro Catching had a training event less than a month out and needed a website and point-of-sale setup for attendee purchases, with dropshipping through the brand's Easton partnership. We built the site in two and a half weeks and connected online purchasing, event point of sale, in-person pickup and Easton dropshipping. We prepared the product catalog on that timeline and gave live technical support on site during the event. The event team recorded more than $100,000 in merchandise and dropshipping sales over the conference weekend (case study).

• One matching key. The register and the website need one field that means the same item in both. On the gift shop build, that's the barcode, stored as the website's SKU.
• Barcodes on everything you sell online. Items without a real barcode in the register can't be matched.
• A register catalog bigger than the website's. The shop's register holds about 6,600 items and the website matches about 1,880. That's the expected shape, so a low match rate isn't a sign the sync is broken.
• A rule for online sales. If online sales don't draw stock down in the register on their own, decide who enters them, and when, before the next read.
• Shipping weights. On that store, no product goes live without a weight, so the checkout can price shipping.
• A daily record you'll read. The shop's sync reports what changed after every run, and we check that the counts moved, not only that no error appeared.
• Shelf counts. No integration can prove the register matches the shelf. That takes a physical count.

• Quantic. Quantic's own online ordering is its own storefront, so a WooCommerce store needs a separate sync. See Quantic POS and WooCommerce.
• Lightspeed Retail. If you're moving off it, see what to check before you leave Lightspeed. On the gift shop's move, label printing was the job still living in Lightspeed.
• Clover. Clover's own plugin takes payments, and inventory sync needs a connector app. See Clover and WooCommerce.
• Square. The free WooCommerce Square extension syncs products and stock. See Square and WooCommerce.
• Shopify POS or another system. Book a free Systems Audit and bring your POS name and your website address.

Once the stock is right, the next job is getting the store found. See ecommerce SEO. When an order or inquiry should also start follow-up with the customer, see WordPress and GoHighLevel implementation.