Can I top up several of my OBUs with one bank transfer?

No, this is unfortunately not possible. For each OBU you want to top up, you need to make a separate bank transfer using your customer number, followed by your complete OBU serial number (with a space between these two references) in your payment instruction. Please be aware that if you do not use the correct reference when topping up your OBU, it will take more time for the top-up amount to be loaded onto your OBU.

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