Invoice-Shipment-Creditmemo Barcodes
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Here is a link to an archive that you can extract into your Magento folder that contains a module for adding barcodes to the PDF documents that Magento generates for Invoices, Shipments, Credit Memos.
I’ve used this in combination with the shipping integration with FedEx and Endicia I have listed in this group. That way invoices can be printed in bulk or individually with a barcode and users can just scan a barcode at the shipping stations.
