Hi,
According to the Merchant API Documentation, the various numeric properties of the order lines should be of decimal precision, but in this SDK they are only double precision?
This causes issues with calculated values like for instance unitPrice because lets say a unit price of 0.15 with a quantity of 2 would give a price of 0.075, but with only double precision that would be rounded to 0.08 which in turn will cause issues with Klarna who expects very precise numeric values.