Good to know that Ideal payment module is now approved!
This is a big plus to NopCommerce, given that a good e-commerce platform should have the most common payment modules available.
From my side, I have already completed a "Sage Pay Server" payment module (100% finished)
In this module you can choose between using an iframe (in the payment info page) or to redirect the customer to Sage pay.
We are launching our first NopCommerce website this week for a client (very excited about that!), so we will upload our payment plugin soon after that.
I have tested the Mollie module with version 2.20 and did not have any problems. If you want to install it on version 2.20 you can edit the description.txt file like this: