Improve Authentication Failure Handling #68
Description
Related to https://github.com/FoxyCart/foxy-app-serverless/pull/219
Short summary: When GETting api.foxycart.com, a 200 will be returned even if the authentication is bad. Subsequent requests will then fail, but the issue becomes sorta opaque at that point, because code relying on a successful response will assume it's a success, and won't throw an error as we would generally want/expect.