In your invoice notification email, it only contains very limited detail: Invoice number, Total Due and Due Date. And a button for paypal payment. It would be great if you could add more detail at least server host name or main IP address. I have 3 servers in knownhost. I'm using different paypal account for each server and record it differently in my accounting. I believe it will be more handy for your clients because we don't need to login to billing each time we get notification, the payment button is already there. Thanks, William