Automatically get key numbers from Zettle via API for POS Count Reports

[flummer]

Numbers needed are:

• Sum of Cash payments
• Sum of HAX sold

Above numbers are for a specific sales unit (personel account), eg. Bar or Info, within the time span for the PosReport.

Ideally it would not be text string matching on personel names and product names, but maybe som UUIDs or similar.

Bar has incorrectly been using amount payment instead of x amount of HAX product, for HAX sales, so maybe that should be either prohibited on Zettle or maybe included, but it's a little hacky and error prone.