Hi Andreas,
— PrestaShop (@PrestaShop) April 6, 2018
This is a voucher that we provide to a lot of our customers today. It's not a refund or something else relative to the Postfinance module that you've bought.
The team confirmed that they will get back to you this afternoon.
https://goo.gl/EO0ad1
https://goo.gl/xF8heB