PASS empty input
PASS number and decimal string
PASS refunded amount excluded
PASS integer cents avoid 0.1 + 0.2 drift
PASS non-paid invalid value ignored
PASS invalid paid amount 
PASS invalid paid amount null
PASS invalid paid amount Infinity
PASS invalid paid amount NaN
PASS invalid paid amount -1
PASS invalid paid amount -1
PASS invalid paid amount 1.001
PASS invalid paid amount 1.001
PASS invalid paid amount hello
PASS invalid paid amount undefined
PASS invalid paid amount [object Object]
PASS invalid paid amount   
PASS non-array null
PASS non-array [object Object]
PASS non-array orders
PASS non-array 42
PASS individual cent overflow
PASS aggregate overflow
PASS safe integer cents boundary
24 checks passed. Original model output unchanged.