Crosslist from WooCommerce to OnBuy: FLUF’s WordPress Plugin for UK Marketplace Selling
For UK WooCommerce shops: list your WordPress products on OnBuy, and keep stock right on both.
7 days for £1, then from £9/month.
- This route is for UK retailers who run a WooCommerce shop on WordPress and want a marketplace channel as well. OnBuy connects to FLUF for UK sellers only.
- OnBuy charges an application fee, a monthly subscription and a sales fee by category. Your own WooCommerce shop charges no commission, so every OnBuy order costs more than a direct one.
- A WooCommerce sale ends the OnBuy listing for you. An OnBuy sale needs two steps: mark it sold in FLUF, then lower the stock in your WordPress admin.
- Pick products you hold in depth and can dispatch within the handling time you promise OnBuy.
- Try it with 7 days for £1, then from £9/month.
Who this route suits
WooCommerce is the WordPress plugin that turns a website into a shop. If your store sells new, branded products and most of its visitors come from Google, your own marketing or repeat customers, OnBuy adds a second source of buyers who never see your website. OnBuy is a general UK marketplace with one product page per item, and your offer sits on that page with the other sellers of the same product.
It is a weaker fit for handmade, one-off or second-hand stock. A shared product page needs a product that exists in more than one shop. It is also a poor fit if you sell only a handful of orders a month, because OnBuy’s subscription is due every month whether you sell or not.
What OnBuy costs a shop owner
On your WordPress site you pay for hosting, a domain and card processing, and nobody takes a share of the sale. OnBuy’s seller terms add a fee to apply, a rolling monthly subscription and a category percentage on each order, taken from the price plus delivery. Listing is free. The OnBuy comparison guide goes through each charge.
For a WooCommerce shop the useful question is margin. Decide per product whether the OnBuy price carries the category fee on top of your website price, or whether you absorb it. One common approach is to keep the website a little cheaper, so loyal customers have a reason to order direct, and let OnBuy bring the buyers who would never have found the site. Whatever you pick, keep a note of it in the product’s internal notes in WordPress so the reasoning survives the next price change.
Dispatch rules to set up first
Under OnBuy’s terms you set a handling time of up to 10 days and a delivery timeframe of 1 to 30 days, and each order must go out within the handling time. Priority orders placed before your cut-off must leave the same day. OnBuy rates sellers on performance, so promise a handling time your packing routine already meets for WooCommerce orders, not a faster one.
Payouts follow OnBuy’s timetable, not your card processor’s. Funds from an order become available to withdraw within 7 days after its delivery timeframe ends, so plan cash flow for marketplace income arriving later than website income.
Keeping WordPress stock right
This is the part to plan for. FLUF sees WooCommerce orders, so a sale on your website ends the OnBuy listing with no action from you. FLUF does not see OnBuy orders, and it does not change stock levels inside WooCommerce. When a unit sells on OnBuy:
- Mark the item sold in FLUF. FLUF ends it on any other marketplace it can end.
- Lower the stock for that product in your WordPress admin, the same way you would for a phone order or a sale at a market stall.
If you already use a WooCommerce order-management or shipping plugin, add the stock change to the same routine you use to print the OnBuy label. Fold both steps into dispatching the OnBuy order, and your website and OnBuy stay in line. If you hold several units of a product, the risk is small. On your last unit, do it straight away.
How to crosslist from WooCommerce to OnBuy
- Install the FLUF Connect plugin for WooCommerce from your WordPress admin and activate it.
- Connect your WooCommerce store to FLUF Connect.
- Connect OnBuy with your OnBuy seller account details.
- Choose the products. Start with lines you hold several units of.
- Set OnBuy prices with the category sales fee in mind.
- Review each listing and publish it to OnBuy.
What FLUF Connect does on this route
| WooCommerce | OnBuy | |
|---|---|---|
| How you connect | The FLUF Connect plugin for WooCommerce | Your OnBuy seller account details |
| FLUF sees a sale here | Yes | No, you mark it sold in FLUF |
| FLUF ends the listing here when the item sells elsewhere | No, you lower the stock in WordPress admin | Yes |
| Relisting and offer management | No | No |
| Who can connect | Any WooCommerce store | UK sellers only |
How much it costs
Crosslisting and inventory sync are on every plan. Start with 7 days for £1, then from £9/month, then plans from £9/month.
| Plan | Monthly | Crosslisted products |
|---|---|---|
| Starter | £9/month | Unlimited |
| Seller | £29/month | Unlimited |
| Pro | £99/month | Unlimited |
| Super Seller | Custom pricing — tell us what you need | Unlimited |
Sources
Sources checked September 2026.
Related guides
Frequently Asked Questions
It works on WordPress sites that run a WooCommerce shop. You install it from your WordPress admin, then connect the store to FLUF Connect.
No. FLUF does not see OnBuy orders or change WooCommerce stock levels. Mark the item sold in FLUF, then lower the stock in your WordPress admin.
FLUF sees the WooCommerce order and ends the OnBuy listing. You do nothing on OnBuy.
FLUF connects OnBuy for UK sellers only.
OnBuy's seller terms list an application fee, a monthly subscription, a sales fee by category on each order, and a refund administration fee when you refund. There is no fee to list.
New, branded products you hold several units of. OnBuy has one page per product, so one-off, handmade or second-hand items fit it poorly.
Yes. You set a handling time of up to 10 days on OnBuy and each order must leave within it. Use the handling time your WooCommerce orders already meet.