SuiteScript 2.0 dates are such a pain 🤦 . The

search.lookupFields

value probably returns a string, the

Payment.setValue

probably wants a Date object. I don't ever use N/format so it's unclear to me if format.parse will actually give you a Date output given a string input. However, I did see that it's supposed to be

format.**Type**

instead of

format.**type**