Earlier quoted context omitted.
This is the first time I hear of „sunset“. Afaik it just is a layer on top and that’s it.
It's in the first paragraph on Wikipedia. Although I know that Wikipedia isn't always 100% correct so take that with a grain of salt. Quote: "Wero is a European mobile payment system that is intended to replace Giropay in Germany, Paylib in France,[1] Payconiq in Belgium[2] and Luxembourg, and iDEAL in the Netherlands."
I was thinking about "SEPA" (more precisely "SEPA Instant") which is the layer WERO builds on.