Are you asking about importing existing records of transactions in Kentico CMS, or would you like to enable payment through eWay Payment Gateway?
If it is the later, you will need to implement the Payment Gateway yourself, as Kentico CMS does not come with eWay Payment Gateway out of the box. You may be able to port this eWay Provider from our Marketplace
to v7, as the Checkout Process is very similar.
You can find more information in this E-Commerce guide article about Custom Payment Gateways
and in this Payment Gateway development video