Whilst the ability to draw campaign summary data via the API to be able to display the total on a webpage is unfortunately not something that the API supports, there may well be other ways in which this could be done.
Available Options
When a donation is placed via a Web Widget, it may be possible for you to collect the amount donated and add this to a temporary table on your web server, and then use the data to display the amount raised on to your web page - this would only account for the online transactions though.
Create a List in Donorfy for the campaign, download the amounts, and then summarise in Excel. The total amount is then used to add to a dynamic graphic (or a graphic that is replaced daily) on the webpage.
