Hey @HolsPel, thanks for your post.
Not too unusual, we've definitely had this request before.
Unfortunately, there's not currently a way to blacklist or block a specific client from making a purchase on your Square Online site.
I'd suggest cancelling the order as soon as it comes in.
If I hear any updates on this particular feature request, I'll update you on this thread.
Breffni
Community Moderator, Ireland, Square
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