You simply install the package (after you already installed the eCommerce package). Then go to ePay website and get an test/full account. When you have got the account you will be able to get merchant code from their website (your account) and you have to put the merchant code in to the C5DK ePay Payment Gateway package under the payment gateways under eCommerce in your dashboard.
Name...
This is the name of this payment gateway add-on
Activate...
If you ar going to use this payment gateway, you of course have to "Activate" this payment methode.
Merchant Number...
This number you get from your ePay account on the ePay website (you have to supply this for the gateway to work).
MD5 Key...
This key you will be able to generate in your account on the ePay website (you have to supply this for the gateway to work).
Valuta...
Here you choose witch valuta your eCommerce shop are using (this has to be a curency that is supported by ePay).
Form Language...
Here you can choose witch language the payment gateway form is using (you can use "auto" for the gateway to autodetect the user language).
Window State...
This is how the paymentgateway will integrate in to your Concrete5 installation. You should try them out to see witch is best for your webshop design/layout.
Add fee...
ePay is taking a fee everytime a customer buy something in your webshop. You can here deside if you will put this fee on top of the customer purchage.
Instant Capture...
If this option is set to on, the payment will instantly release the payment on checkout. If set to off, you will have to manually release the payment to your account through the order page (set the order to ither shipped or completed).
Restrict payment cards...
This is the settings of witch payment cards/methods you are alowing your customers to use (this should be the same as the ePay payment model that you have purchaged on the ePay website).
More information (in danish) can be obtained from http://webshopdemo.concrete5.dk/