On the Insights app, there are two significant dollar values shown, one for total sales and the other for total takings.
Sales section
Totals Sales
All sales that have been put through the POS, including sales not yet paid for.
The same figure is found in the Sales Summary report, from Office > Reports > Financial > Summary > Sales Excl
Patron Count
The number of patrons. If patrons are not being tracked, one patron = one sale instead.
Average Spend
Based on per patron. This amount includes GST, as we record patrons only when payment is made.
Total Takings
This is what will be banked for the period and includes GST. It excludes sales not yet paid for, e.g tables and tabs.
The same figure is found in the Cashup report, from Office > Reports > Financial > Cashup > Payments total
Difference between Total Sales and Total Takings
Between Total Sales and Total Takings, there is usually only a factor of GST difference between them.
As both sets of info come from quite different sources though, it's important that both are represented on the app.