[TYPO3-commerce] Payment via Creditcard

[Christopher Schnell]

Hi all,

I have to implement a Credit Card for a gateway into commerce.

Did I understand it corretly that I have to create an extension that 
extends the class "class.tx_commerce_payment_creditcard.php"?

Are there any examples how to do this (any extension that extends the 
payment Article Credit Card)?

All, I "would" have to do is, change the URL of the checkout form to 
point to the  payment provider and add some hidden  fields.  What is the 
best way to do this?

Thanks a lot for any help on this topic.