
OpenCart extension: Bad Customers - link here
OpenCart versions supported: v2.0.0.0 - v3.0.3.6.
Automatically detect fraudulent orders and misbehaving customers. Add customer or guest orders to the blacklist, and all of the future orders from the same customers will be highlighted automatically even they use different name or address.

After the latest update (2020-11-27) you can enter the reason why customer or guest was added to the blacklist - it will show up everytime you put a mouse (hover) over the highlighted order.

More details here >> Bad Customers extension @ OpenCart extension store.