Certain resource objects (like Shipments and Containers) have a metadata attribute in their response
payloads. Metadata attributes are known as Tags on the user-facing side of the application. Metadata is useful
for storing information on a resource that is not already captured in a Flexport-defined field.
There are two types of metadata formats supported.
The default metadata format is a key-value hash format where the keys are strings, and the values are an array of strings.
metadata: {color: ["red", "blue"]}
An alternate supported format is an array of key defined hashes where the keys are "name" and "value".
metadata: [{name: "color", value: ["red", "blue"]}
The response payload for metadata will always display the default metadata hash format. To display the
metadata array format, a URL parameter will need to provided called use_name_value_metadata_format=true.
By default, this is false.