[TYPO3-commerce] Is there any possibility to have an price of 0 Euro for a payment-method?

[Sven Schumacher]

Hello,

we would like to have 2 options for payment:
prepaid (no extra costs for the customers) price: 0.00 Euro
payondelivery (only selectable on special range of date) price: 0.00 Euro

payondelivery will only be selectable, when the delivery-option "send 
via post" isn't available anymore because the letter will arive too late 
and the only selectable deliverymethod is "pick-up on pay desk".

So far no problems, except, that the checkout page says: "No items in 
basket". If we raise the prices >0 the checkout lists correctly the items.

Any suggestions to solve this problem?

Thanks

Sven