Consume REST web service with dynamic fields

Consume REST web service with dynamic fields

  
This is an interesting website, the fields are not always the same and the fields are not initially defined.

What is the best way to consume a REST web service that contains dynamic fields?
https://stripe.com/docs/api#list_country_specs

(
I know how to consume this via integration studio in c#, (it's painful), but don't know how to do this via service studio built in consume REST feature)
Ugh... really? Dynamic JSON? Following this, I think I need to do this integration too... :(

J.Ja
Just define all the fields (including the optional ones). Attributes of the receiving structure that are not represented by fields in the JSON will be set to their default value.