HI Rutger! To keep you and your money safe, we've recently implemented some security improvements in bunq.me. One of these improvements is the addition of Google reCAPTCHA, which verifies that you are a real human and not a robot or a scammer. If you see this message, it means we could not successfully verify that.
We realise that this isn't ideal in every situation, which is why we're currently improving the way this works by allowing you to do one of those puzzles (you know the ones, where you have to click cars or phone booths), instead of simply blocking you from paying at all. We're rolling this out as soon as possible, and when we do, we'll be sure to let you know here!
