Work with URIs, not ids

[thatmarvin]

The official word from Balanced is "Always, always store the uri". For reasons outlined in the docs, you can infer that you should really access the resources using the URIs in the responses instead of constructing the URI string yourself.

For example, this would break one day when Balanced starts using /v2/marketplaces/…, or if you need to support a mixture of both v1 and v2 resources (both should continue to work).