Accept fractions of a cent in UnitAmount
The majority of our invoices are for many hundred thousands of units, each of which cost something like USD$0.00015.
The API currently rounds this LineAmount to 0.00 then complains that my total doesn't equal the sum of the lines.
Whoops, apologies folks – we have released a feature that supports 4 decimal places on UnitAmounts:
Apologies for being slow to update this thread.