If the product contains a barcode you will be able to read it with the App and add it to the product sheet.
Enter the App > Catalog > + to create a new product and then click on the barcode symbol, the camera of your mobile will open so you can capture the product code, finally click on save.
You should also know that you can add products in the documents by barcode scanning, if you have the products saved that way.
To do this, you must create a new document, press + to open the catalog and then click on the barcode symbol, the camera of your cell phone will open to capture all the products you need, they will be automatically added to the document.