With Lendence, you can easily create your own barcodes and also link existing barcodes directly in the app.
How do I link an item with a barcode?
First, go to Inventory in the app, then click on the right icon for an item and then click on Connect barcode.
How do I borrow with a barcode?
Open the app and click on Borrow. Then click on Scan with and then Barcode.