eBay Marketplace Integration: What to Expect
22 October 2026
An eBay marketplace integration connects your eBay store to a tool that reads your orders and costs automatically. The value is in how complete that data is. eBay profit is easy to overstate, because several costs sit outside the sale price.
The costs behind an eBay sale
- Final Value Fee, which varies by category rather than being one flat rate
- Promoted Listings ad spend, which can quietly erode margin on your best sellers
- Shipping and postage, including labels you buy yourself
- Product cost and any operating costs
- Refunds and returns
Because eBay processes payments itself through Managed Payments, the amount that reaches you is already net of fees, which makes it harder to work backwards from a bank statement to a profit per item.
What a good integration does
- Takes the Final Value Fee from the actual order at its real category rate
- Shows Promoted Listings spend against the listing it boosted
- Counts postage you buy as a real cost of the sale
- Gives profit and margin per order and per SKU
Check after connecting
- Compare a few orders with eBay's own records to confirm fees match
- Find which promoted listings earn more than they cost
- Look at your best sellers by profit, not by units sold
An example
A listing sells well, so you promote it. Sales rise, but the Promoted Listings fee takes a bigger share of each sale. If the Final Value Fee, postage and promotion together leave a couple of pounds per order, the listing is busy but not very profitable. Seeing the real fee on each order is what shows that.
Does eBay show me profit per item?
eBay reports sales and fees, but a profit per item needs your product cost and postage as well. A connected tool brings those together.
What are Promoted Listings?
They are eBay's advertising option, where you pay to boost a listing's visibility. They are a real cost of the sale and should be counted as one.
Can I connect more than one eBay account?
Ask us about your setup. Many sellers run several stores, and what matters is that each connects and appears in one view.
WhatSales connects to your eBay store and rebuilds every order into one profit figure after Final Value Fees, Promoted Listings spend, shipping and product cost. The detail is at /integrations/ebay, and you can see eBay next to your other channels on /profitability.