My own script kit for Shopify catalog work, shown on made-up files for a fictional lighting brand. New products go into an import file built on the store's export columns, each as a draft, and a missing spec is left empty and listed. Edits to existing listings come first as a side-by-side preview to approve. Afterwards it compares the fields in the before and after exports you supply and lists differences outside the agreed batch (here, one planted price change); it can't verify that an export is complete. Tested on made-up files only, not on a client's store, and it never writes to a store itself.