Thanks everyone for pointing me in the right direction.While I couldn't get the extractor or flattener to work, I ended up using a JSONFragmenter and AttributeExposer to get at some of the columns we needed.
The next step is to figure out how to get the nested array values from the APIs.
The response you are getting from the httpcaller is in JSON.You need to use a JSONExtractor or JSONFlattener prior to the excel writer.
You will also need to expose the attributes (if known/static) or use the schemasetter and dynamic settings on the writer.