On API design

API design is hard.

If your software makes the behavior hard to change, your software thwarts the very reason that software exists.

- Robert C. Martin

ref. Sandia LabNews on February 14, 2019

What happens when in a design meeting, you're sure that a thing will NEVER happen? Until it does!
What if you were adamant, a value added tax percentage will NEVER be anything else than an integer? Until it does!

From news on 16th Apr 2024: Reports: Finnish government to raise general value-added tax rate to 25.5%

Meanwhile...

At Paytrail API (https://docs.paytrail.com/#/):

At Visma Netvisor API (https://support.netvisor.fi/en/support/solutions/articles/77000554152-import-sales-invoice-or-order-salesinvoice-nv):

I don't think there is much to do. You take yout your humility hat and start eating the bitter oat porridge to get the thing fixed.

Btw. thanks to Afterdawn on bringing this to our attention.

Bottom line: It shouldn't be too hard to figure out what politicians do. They don't think rational (thoughts nor numbers).
Examples from France and Monaco (VAT rates 20%, 10%, 5.5%, 2.1%), Ireland (VAT rates 23%, 13.5%, 9%, 4.8%), Liechtenstein (VAT rates 8.1%, 2.6%, 3.8%), Slovenia (VAT rates 22%, 9.5%, 5%) or Switzerland (VAT 8.1%, 2.6%, 3.8%).