Hello Willem:

There isn't yet a payment provider for this, but you can use the documentation below to create your own.

https://hotcakescommerce....ment-Gateway-Project

Also, if you feel that there's enough demand for this provider to be available as an out-of-the-box feature, please created an issue and feel free to begin a pull request.

https://github.com/HotcakesCommerce/core

Willem, did you develop a HCC3 Mollie Payment provider for iDeal? If not, maybe we can develop one together! Let me know.