Payment method (Mollie) not working

Hello

We’re trying to add the ‘Mollie’ payment method to an existing shop where you can already pay with PayPal Express, (We’ve also tested it with 2Checkout and that works as well) the option is showing up but when you submit the form (with Mollie selected that is), nothing happens. The page just refreshes and all data in the form’s gone.

We’ve activated Mollie in the plugins & we’ve tried to make it work with both the test & live version. Since Mollie doesn’t seem to require extra configuration we’re kinda helpless.. We’ve tried just about anything but I’m sure it’s just a simple thing we’re missing..

We’re using Store 2.3.1 in EE 2.8.1

Can you please be our Obi-Wan?