In order to activate the module to scan the barcodes of your products follow these steps:
Go to your backoffice>configuration>modules>order taking settings
Activate the “barcode scanning” module.
In your backoffice go to inventory>products
Click the product(s) you want to add a barcode.
In the pop up window with the information of the product you can add the barcode of the product.
Refresh your app.
Now after I set up my barcode scanner on the iPad, everytime you will scan a product in your app it will be added to your order. *Remember to add a barcode with the correct format of numbers.