An analyst needs to configure an Affiliate marketing channel within the Marketing Channel Processing Rules.
Traffic from this channel uses the "source" and "campaign_name" query parameters. The "source" query parameter is used by other marketing channels. Traffic from the Affiliate marketing channel this query parameter with a value that starts with "aff". Affiliate traffic may NOT have a defined value for "campaign name".
How should the analyst configure the processing rule so that any hits from affiliate are added to the Affiliate marketing channel?