Buyer paid cash on collection

I sold an item on a buy now basis and accepted an offer of £65.
The buyer lived local to me and paid cash on collection.
How do I ensure that eBay gets their fees for the sale.
I don't want to break any contract I have with eBay.
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Assuming they paid no postage first send a revised invoice without postage.   That will automatically remove that part of the selling fee.  Go to More Actions, far right of item on your sold page > Send Payment Details.  Delete the postage but do not click on "reset" afterwards.  

 

Then mark as payment received and item dispatched via More Actions again.