Use Patron ID for Patron Account Information such as LISTs in Vega Discover
When patrons get a new barcode they currently lose access to their lists in Vega Discover. Lists should be tied to the PATRON ID not the barcode. Barcodes are temporary, IDs are the persistent identifier for a patron account and should not change.
Patrons replace library cards frequently. They get lost or damaged. Patrons move from one home library to another within the system. Patrons get a new card when libraries offer new designs.

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Barth, Christine commented
Patrons lose or replace their cards all the time. We also give the patrons the option to get a new card when theirs wears out. Lists and other data should transfer with the patron without any staff involvement.