Best reply, but... How often is a typo made (1:1000?), how much time for support staff is needed and how many lost orders due to a ~24 hour delay in some orders being placed. Also, easy to flood the system with bad orders that need to be manually sorted, like a fake order DDoS.
If a typo is made 1:1000 times Candy Japan would have had.. 2? At this small scale it's probably worth it - the loss of a customer isn't as big a problem as loss of physical goods.
Not to mention that you can verify the Luhn checksum on CC numbers and immediately catch ~90% of all typos (and 100% of single-digit typos). Don't even need a server call.
