From the version 1.8.0 we support option for easy share on web and QR. To setup the plugin follow these steps:
Visit ShareThis official site. Create new account or login with existing one.
After login you will need to add your domain.
Select your domain that you added and enable from the tools Inline Share Buttons.
Click on the the enabled tool and customize the buttons that you will use in your website.
After you finish with the customization from the left menu select Settings and find your Property ID.
Now you can add this credential in your Settings page. Select Plugins option.