If you have this, check next things:
Do you have approved programs in your affiliate system? Most of affiliate aggregators require approved programs to use in the API. Also, not all merchants add their products in the product API feed.
Do you have enabled advanced search filters? It's a very common issue, when users enable a filter like “Search only in Amazon products” that will search products which belong to Amazon company.
There are two ways to add custom logos
1. You can upload your custom logos to directory
Use file format:
2. Go to CE General settings -> Merchnat logos and add logo URL: