H Luke, thanks for this - for some reason I thought a payment also had a % attached.
My bank charges 0.13cts per incasso and 2.10 per batch - so if I bundle >10 in a batch it would be cheaper.
I investigated a bit further and Mollie (the payment provider we have been using) only charges 0.25cts. Accept Direct Debit payments on your webshop | Mollie
I requested this elsewhere (Mollie payment integration) - so an implementation with mollie alongside stripe would be pretty awesome…