Orders
Your purchases
Every package, what it gave you and the Ko-fi transaction id — the receipt you can point at if anything ever looks wrong.
Receipts kept in this browser
Go to the store
Voucher
Paid on Ko-fi without the store?
Ko-fi never passes your SteamID through, so a purchase made straight on the Ko-fi page cannot be attached to an account on its own. It becomes a voucher instead — claim it here and the reward lands.
I have the Ko-fi receipt but not the code
The transaction id is in the email Ko-fi sent you after paying.