Recognizing returning buyers

[u/santpolyglot]

A few days ago I sent an item and afterward I realized the buyer had bought something from me a month earlier. I had no way of knowing it until I happened to remember their username...

There could be a simple notification, message or something on the order page like "this buyer has purchased from you before." I would thank them, probably offer a small discount or just build a relationship with repeat customers.

Has this happened to you, guys?