I have been using query parameters for the landing pages to identify the paid channel visits and conversions. But when I check the affiliate campaign performance with the entry pages broke down, I could see Google paid search conversions attributed to the Affiliate channel. Also, there are few entry pages without any query parameters as a landing for this channel. Image reference is below. We have these issues for other channels as well.
Understand. Breaking Last Touch Channel by expiration related dimensions like Tracking Code or Visit related dimensions like Entry Pages will not give you the right answer, because both work differently.
Breakdown the Last Touch Channel by Last Touch Channel Detail to understand the entries or tracking codes those attributed for the channel. It would give you the exact results!