Here a short description how to enable Ideal (dutch bank) payments in the Stripe implementation of Dolibarr 12.0.3:
in file /htdocs/public/payment/newpayment.php
In line 1995 you can find the payment methods; by default only card is enabled:
‘payment_method_types’ => array(‘card’),
As per description in the Strip documentation you can add Ideal in this list by changing line 1995 into:
‘payment_method_types’ => array(‘card’,‘ideal’),
And that is it. The support for Ideal is already implemented in the rest of the modules.