Index Match Formula Using Multiple Sheets

I'm trying to write an index match formula for a downstream transaction sheet in which if payment date is not found on sheet 1 it would be pulled from sheet 2. I tried the below IF INDEX MATCH formula but got an #INVALID REF error.


=IF(INDEX({Payment Date}, MATCH(Invoice Number, {Invoice Number }, 0)) = 1, INDEX({Payment Date}, MATCH(Invoice Number Final, {Invoice Number Final}, 0)))


Any thoughts?

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