You can tell Salesfire how to find the basket value on the page by providing a Selector.
A Selector is a browser feature that allows websites to find certain elements on a web page.
For example, a Selector may look like:
#basket .total .GBP
Once you have got the Selector for your basket value, you can enter it under Preferences > General within your Salesfire Dashboard.
You can add multiple Selectors and it will look at each one until it detects the first one on the page.