So far Totals seems to be a great product. One feature that I would love to see is the ability to add a PayPal button or link to either a layout or email body. A link like the one below allows for payment of an invoice in a quick and easy way for connected customers. (Text in square brackets represent fields from Totals.)
h t t p s : / / www.paypal.com/cgi-bin/webscr?cmd=_xclick&business=[MYEMAIL]&amount=[TOTAL]&invoice=[DOCUMENT#]&on1=Invoice%20No&os1=[DOCUMENT#]&item_name=Payment%20to%20[MYCOMPANY]&on0=From&os0=[CLIENTPRIMARY]¤cy_code=[CURRENCY_CODE]&custom=Totals
Some options could be ... 1) set the [PROJECT_NAME] as the item_name rather than Payment to Company. 2) have a PayPal address on 'General' tab of the preferences to use if the paypal account email is different than the primary business email