Receiptful Magento extension

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.

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