Accesses the CafePress API via shortcodes to display millions of products based on search terms and product types. PHP5 is required.
No. You can join the CafePress affiliate program without being a shopkeeper.
If you are a CafePress shopkeeper, you can show your own products by using a unique tag on your designs. Leave off the affiliate information and it will link directly to your shop without having to be an affiliate.
No, all revenues and clicks belong to you.