Retrofit How to map fields from JSON response to non-matching model fields?

Question

Android

Suppose the web service returns a JSON user object: {"user_ig"="32432", "user_name"="Ivan"}
I use Retrofit and GSON and having a User class with fields 'user_id' and 'user_name' I get the parsed object without problems.
But what should I do if I do not want the field names of my model to depend on a third-party service:

Class User {
    public id;
    public name;
}

Answer 1

@SerializedName