If you would like to create PIN codes for your visitors, you can easily do this through the Swiftlane app. First go to your profile and click on Visitor Access. From here you will be able to auto generate unique pins for your visitors and manage them over time. You can create a PIN for a one time use or create a PIN that can be used multiple times. You can easily deny access by deleting the PIN.
Feel free to use the screenshots below for your reference.
If you do not have the option to create a PIN, this could be a feature not offered in your building. If so, please contact your admin.