If you want to share audiences from AppsFlyer to Hybe via API, you just need to enter the Cloud_ID of the relevant app to the field in AF, it will be used as the API-key for this integration. Then, select Hybe as a media partner and enter the Connection name.

On the screenshots below you can see some basic filters and variables for audience building/

Here you can select only users from a specific GEO or users, who made exact revenue you specified:

Then, you can restrict the audience based on any events inside the application.

Example of basic segment configuration:

Another example of a more complex version with a logical intersection of two segments: