Hi Steve,
We can not provide contentIDs for channels on our platform. As you've seen in the instances of Netflix and VUDU, there are occasions where you can find a channel's contentIDs without contacting the developer, and you're free to use that information however you'd like. However, if this information is not publicly available then you'll need to work directly with the channel owners to get that information.
It was wise to reach out to Amazon's customer support team — hopefully they'll provide the information you're looking for.