There are two ATMs in Wietzendorf: one from the Volksbank and one from the Sparkasse - both in the centre of town.
You can also easily take cash with you when paying at the checkout at Nahkauf: From a purchase value of €10, you can get up to €200 paid out. Important: This only works with a German Girocard (EC card with the "Girocard" or "Maestro" symbol). Other card types, e.g. credit cards , are unfortunately not possible.