Integrate with plugin “Print Barcode Labels for your WooCommerce products/orders” follow this way:

#1. add this short code to your theme / functions.php or any snippet code plugin

 function custom_op_barcode_key_setting($fields){
     $fields['digital_barcode_product_field'] = "WooCommerce Barcode - Print barcode";
     return $fields;
 }
 add_filter( 'op_barcode_key_setting', 'custom_op_barcode_key_setting' ,10,1);

#2. goto admin/pos/setting/product barcode / barcode meta key choose value = “Woocomerce barcode – Print barcode ” . save

#3. Logout and login pos again. Now, POS can work / scan with barcode label generate by “Print Barcode Labels for your WooCommerce products/orders” plugin without problem .