If you are new to web service interfaces, first review HTTP Response Structure for an overview of what information you can typically find in an HTTP response.
Example: Queried a web service from Building HTTP Requests
use sample json response
HTTP status codes provide valuable information about the outcome of the request, and based on these codes, different actions can be taken, such as retries or error handling.
conditional logic to handle status codes and parse response
queue successful payload for downstream processing
parse error messages
retry or log errors?
...