You can insert the order barcode or QR code, when generated, in all the order emails or only in the one sent when the order goes to Completed status.
You will find the related options in the Product barcode and Order barcode settings.
This option allows you to show the barcode or QR code of all products included in the order in the order confirmation email. Enable it from YITH > Barcodes > Product Barcodes > Show product barcodes in order emails.
If you want to also show the order barcode or QR code, you can enable this option from YITH > Barcodes > Product Barcodes > Show order barcodes in order emails and choose between one of the following options: