Hello, @Paul-Z-F!
Thank you for your post and welcome to the Community!
I understand your client is asking you for a full refund. If you have shipped the product and it is exactly what your client paid for, the decision to issue the refund depends on your refund policy. PayPal Buyer Protection doesn't cover the buyer if they change their mind about their purchase. However, if they don't receive the item or if they receive an item significantly not as described, they can open a dispute and will be covered by PayPal Buyer Protection. Please click on the following link to find more information about PayPal Seller Protection.
I hope this information helps.
Regards,
María.
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