Google Play Advertising ID.
The advertising ID is a unique ID for advertising, provided by Google Play services for use in Google Play apps. Used by Instagram.
https://support.google.com/googleplay/android-developer/answer/6048248?hl=en
Optional
Should be received form either launcher/mobileconfig or launcher/sync
launcher/mobileconfig
launcher/sync
x-ig-family-device-id header.
x-ig-family-device-id
Not sure if it's randomly generated, but let it be
It is used "as is" in some of requests
Static
Google Play Advertising ID.
The advertising ID is a unique ID for advertising, provided by Google Play services for use in Google Play apps. Used by Instagram.