Finale doesn't generate GS1 registered UPCs, instead we generate generic UPC formatted numbers. Our shortcodes are a 12 digit internal code that's in a valid UPC format.
When a new product is created, Finale will automatically create a new "Finale Short Code" which in an internal code in the standard UPC form for each unique product. Additionally, a new Finale Shortcode is created for each new packing and/or lot id.
If your products already have barcodes on them, Finale can be easily configured to allow the scanner to read them.
Please see this help article for more information regarding shortcodes: https://support.finaleinventory.com/hc/en-us/articles/115007669047