OctoResellSold the same item on two platforms? What to do
Pick which sale to keep, cancel the other quickly, tell that buyer plainly what happened, and take the item down everywhere else. Read the cancellation rules of the marketplace you cancel on first.
The shortcut: OctoResell is a Chrome extension that copies a listing to your other marketplaces, fills each form for you and removes sold items from the rest. Free for 5 fills a day.
Add to Chrome, free- Cancel the second order quickly and tell the buyer why. Each marketplace has its own cancellation rules.
- Poshmark announced a performance program that needs a cancellation rate of 2% or less over a rolling 90 days.
- Mercari lets sellers cancel only when they cannot fill or ship the order, and frequent cancellations can affect the account.
- Delisting the moment an item sells is the cheapest fix.
Updated October 2026. OctoResell is a Chrome extension (it also works in Brave and Edge) that copies a listing to the other marketplaces, fills each form for you, and removes sold items from your other listings.
Do this first
- Delist everywhere else so it cannot sell a third time.
- Decide which sale to keep. Many sellers keep the first buyer who paid. Others cancel on the marketplace that penalises cancellations the least.
- Check the cancellation rules of the marketplace you are about to cancel on. Rules, deadlines and any effect on your account differ by site.
Cancelling and talking to the buyer
- Cancel through the marketplace’s own order tools, not by ignoring the order.
- Message the buyer straight away and say what happened. Buyers respond far better to a quick, honest note than to silence.
- If you can, offer something useful, such as a similar item or a discount on another one.
Protect your account
Cancellations can show up in your seller metrics, and some marketplaces limit sellers who cancel often. That is why prevention matters more than recovery. Read each marketplace’s seller policy, and do not assume cancelling is free anywhere.
Stop it happening again
The cause is always the gap between a sale and the cleanup. Shrink that gap with a routine, or let automatic delisting do it.
What each marketplace says about cancelling
- Poshmark: its July 30, 2026 policy update describes a seller performance program that starts in October and requires a cancellation rate of 2% or less on a rolling 90 days.
- Mercari: its help center says sellers may cancel only when they cannot fill or ship the order, and that frequent cancellations can affect the account.
- eBay: it has a dedicated order cancellation policy that covers when a seller can cancel and what happens to defect rates.
- Etsy: if you cannot complete an order, tell the buyer, cancel it and refund.
Read each policy for the exact current rules before you cancel, as they change.
Sources
- Poshmark blog, July 30, 2026: policy update
- Mercari Help Center: cancelling an order
- eBay order cancellation policy
Questions
Which buyer should I keep?
There is no single rule. Many sellers keep the first paid order. Choose the one that carries the least penalty for you, and be consistent.
Will cancelling hurt my seller account?
It can. Each marketplace treats cancellations differently, so read its seller policy before you cancel.
Should I tell the buyer I double sold?
Yes, quickly and plainly. A short honest message keeps most buyers on your side.
How do I prevent it happening again?
Delist the moment an item sells, or use a tool that does it for you.
OctoResell does these steps for you. Free for 5 fills a day, or $15 a month for unlimited crosslisting. Cancel anytime.