Already some good advice here, so I'll just add a couple we used to use at a place I worked at that sold physical goods (of the kind that prove surprisingly pop

Already some good advice here, so I'll just add a couple we used to use at a place I worked at that sold physical goods (of the kind that prove surprisingly popular to fraudsters). - I don't think Paypal offers address verification other than under 'verified' accounts but it might be worth asking depending on which service you are using. - We used to flag deliveries to "Suite XXX", "Apartment XXa" etc for further investigation as in the UK these types of address are usually no more than PO box services. Find out what kind of address the common mailbox services offer and if it's fairly uncommon, do something similar. - Sounds a bit obvious, but large initial orders can also be a red flag. A first time visitor ordering £1100 worth of stuff is going to warrant more attention than a long-time customer. - Wherever possible try to indentify frauds yourselves. Payment providers will just transfer the cost to you and law enforcment, in my experience, couldn't care less (we were actually told they have an unofficial policy of non-investigation for < £10,000). Basically, as I'm sure you understand, if you get burned - you've lost it for good.