Explore this app to integrate with your QBO. Intuit has acquired it last year to be part of the family. It supports barcodes & barcode scanning within the web & mobile applications. You simply need to generate your barcodes and input them into the app against your SKUs. It requires barcode numbers to have at least 6 digits or more, otherwise, they are not guaranteed to work. Then, every time you have to create a sales order/purchase order you can scan the barcode of the product to retrieve the product from the app instead of manually typing out the SKU.

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