If your website shop uses the Actinic Catalog shopping cart, then you need to include some special links in the resultY.html and resultC.html pages.
resultY.html - this file needs to contain the following link, enabling the shopper to retrieve the receipt from your website:
<a href="<wpdisplay item=CACTCAT_ReceiptPage>">
resultC.html - this file needs to contain the following link, enabling the shopper to return to your website:
<a href="<wpdisplay item=CACTCAT_ReturnToShop>">
The wpdisplay tags enable the substitution feature to supply the values of special Actinic-specific parameters, which provide destination URLs for the required links.