Hello,

As far as I know, the actual footer totals aren't stored anywhere accessible in server-side code.  I don't think they're calculated until render-time.

For workarounds, I can think of three:
- Manually duplicate corresponding calculations in server-side code.
- Duplicate corresponding calculations using WebCalcManager.
- Retrieve the value from the footer using client-side code.

We already have a feature request on-hand for the ability to access the footer's actual values in server-side code.