Compatible with 1.3.8
Copy the contents of the HTTPdocs to your wordpress directory and merge/replace all files when prompted.
Login to your wordpress admin page and click on Shopp on the left hand side. Then click on System from the drop-down menu.
From the payments tab, click on the add a payment system drop down tab and select Cardstream from the list.
Configure the module by entering your Merchant ID and Signature Key, plus the name of the payment method displayed to the customer. Click Save Changes.