The SCA is a requirement of the EU. Read more about it at Wikipedia. It comes into force from 14 September 2019. However several EEA countries have announced that their implementation will be temporarily delayed. For Visa and Mastercard credit cards this means that 3-D Secure 2.0 needs to be supported.

Current status 13. September: Not yet done.

Our payment provider Heidelberg is working towards fully supporting 3-D Secure 2.0 also for recurring payments. We'll update here when this work is done.