- Subscribe for a Receiptful free account.
- Select
custom
as store type and use a real url (it needs to be checked). - Copy the api key at the end of the process.
- Download the latest
tgz
package from the releases page. - Install through your Magento Connect Manager. You may need to logout and login again.
- Go to System > Configuration > Receiptful and paste your api key there.
Enjoy your supercharged receipts.