Reference: https://live.paloaltonetworks.com/t5/best-practice-assessment-blogs/the-best-practice-assessment- bpa-tool-for-ngfw-and-panorama/ba-p/248343

An application filter is an object that dynamically groups applications based on application attributes that you define, including category, subcategory, technology, risk factor, and characteristic. This is useful when you want to safely enable access to applications that you do not explicitly sanction, but that you want users to be able to access. For example, you may want to enable employees to choose their own office programs (such as Evernote, Google Docs, or Microsoft Office 365) for business use. To safely enable these types of applications, you could create an application filter that matches on the Category business-systems and the Subcategory office-programs. As new applications office programs emerge and new App-IDs get created, these new applications will automatically match the filter you defined; you will not have to make any additional changes to your policy rulebase to safely enable any application that matches the attributes you defined for the filter.
https://docs.paloaltonetworks.com/pan-os/9-0/pan-os-admin/app-id/use-application-objects-in -policy/create- an-application-filter.html

Reference: http://live.paloaltonetworks.com//t5/image/serverpage/image-id/12862i950F549C7D4E6309

To create SD-WAN interfaces through an API, the correct approach is to use the REST API's
"sdwanInterfaces" parameter on a firewall device. This parameter allows you to configure SD-WAN interfaces directly on the firewall devices via API, ensuring that the required interfaces are set up and managed for SD-WAN functionality.