When Google withdraws and refunds 1€ to check if my Mastercard is valid, the bunq App says that this is a failed transaction and shows an exclamation sign. Maybe you can invent something to show the bunq user that everything is fine. Currently it just looks like something is not good and maybe some users might be worried when seeing this.
Im not sure if thats only a Problem with Google. Still waiting for the Refund from DEEZER.