It is possible that the payment receipt (which takes up to three days) and the sending of the reminder have overlapped.

Did you transfer the payment immediately or shortly after receiving the invoice and still received a reminder?
Please contact our customer service at kundendienst@parkster.com. Please send us your transfer receipt, clearly showing the transfer date, the recipient IBAN, and the purpose of the transfer; we will forward an inquiry to our payment service provider.

Did you receive a notification that your payment has been received by us? Please check your email inbox. If your payment has been received, the reminder is no longer valid.