You can open a barcode scanner within your Mapsly mobile app. To configure the barcode scanner, you need to add a new text field inside your form and check the "Enable bar/QR code" box:

Optionally, you can check the "Allow user to type in text value manually" option or leave it unchecked if you don't want your users to be able to enter any value manually inside that text field.

Once this form is opened, you will see a barcode icon next to your text fields where you have enabled the barcode:

Upon clicking the barcode icon, your phone will open the camera and let you scan the code. Once the code is scanned the value will automatically be filled in your text field.