+1 yes a buyer blacklist is needed for sure.
There is currently no way to block certain amazon buyers at all.
We've recently released an app via the Linnworks application store that you might find fulfils most of the criteria you've listed here:
- Can add to a blacklist by searching for any open or processed order (#1 & #3)
- Can flag orders that are made by customers on the blacklist (#2, although it can't make the whole order red, unfortunately, but it can add the inbuilt Linnworks flag of your choice)
p.s. For Road-Knights-Online: as it stands the app won't work for Amazon buyers, because Linnworks doesn't receive the email address of the buyer, which is what we use for our blacklist. However, if the app is well received there's no doubt it'll be one of the first updates; to make a more comprehensive blacklist that includes buyer name, postal info & various account usernames to make an intelligent judgement as to whether an order is from bad buyer.