it's always dangerous to talk about things of a " friend" , how sure are you that you got all information.
Even when you think you are right, it doesn't mean you get right.
-Perhaps your friend had too many messages and accidently declined the delivery?
-Perhaps the delivery just failed?
-Perhaps the payment was returned the next day, and didn't notice?
also keep in mind many creators/merchants use a second avatar for their non business second life, they are not always online, im's can get capped, notecards too when there are too many messages waiting...
shortly... there is so much what can go wrong in deliveries and communications, don't AR too soon, and also keep in mind when you AR and it's declined, and you get a counter AR from the one you reported, you might be in trouble.