How to decode JSON Array with different objects with Codable in Swift?

I have a JSON which consist of a top object then an array which consist of different JSON Objects. I want to decode this json with minimal struct and without optional variables. If I can achieve, I also want to design a struct which handles all of the array objects via writing only Its relevant struct.

I'll try to simplify the example

As You can see in the image both "Id", "Token", "ServicePublicKey" are different JSON objects. Whole of my backend returns in this architecture of JSON. What I want to achive is that one struct as a wrapper and struct for (Id, ServicePublicKey, Token etc..). At the end when there is a new type coming from JSON, I need to write only relevant struct and add some code inside wrapper.

My Question is that: How can I parse this JSON without any optional variable?

How I try to parse it:

struct Initialization: Decodable {
var error: BunqError? //TODO: Change this type to a right one
var id: Int?
var publicKey: String?
var token: Token?

enum CodingKeys: String, CodingKey {
    case error = "Error"
    case data = "Response"
    case Id = "Id"
    case id = "id"
    case ServerPublicKey = "ServerPublicKey"
    case Token = "Token"
}

init(from decoder: Decoder) throws {
    let container = try decoder.container(keyedBy: CodingKeys.self)
    error = nil
    if let errorArray = try container.decodeIfPresent([BunqError].self, forKey: .error) {
        if !errorArray.isEmpty {
            error = errorArray[0]
        }
    }
    if let unwrappedResponse = try container.decodeIfPresent([Response<Id>].self, forKey: .data) {
        print(unwrappedResponse)
    }
}
}
struct Response<T: Decodable>: Decodable {
let responseModel: T?

enum CodingKeys: String, CodingKey {
    case Id = "Id"
    case ServerPublicKey = "ServerPublicKey"
    case Token = "Token"
}

init(from decoder: Decoder) throws {
    let container = try decoder.container(keyedBy: CodingKeys.self)
    switch "\(T.self)"
    {
    case CodingKeys.Id.rawValue:
        self.responseModel = try container.decode(T.self, forKey: .Id)
        break;
    case CodingKeys.ServerPublicKey.rawValue:
        self.responseModel = try container.decode(T.self, forKey: .ServerPublicKey)
        break;
    default:
        self.responseModel = nil
        break;
    }
}
}

struct Id: Decodable {
let id: Int

enum CodingKeys: String, CodingKey {
    case id = "id"
}
}

struct ServerPublicKey: Decodable {
let server_public_key: String
}
struct Token: Decodable {
let created: String
let updated: String
let id: Int
let token: String
}

Json Example:

    {
  "Response" : [
    {
      "Id" : {
        "id" : 123456
      }
    },
    {
      "Token" : {
        "token" : "myToken",
        "updated" : "2020-01-11 13:55:43.397764",
        "created" : "2020-01-11 13:55:43.397764",
        "id" : 123456
      }
    },
    {
      "ServerPublicKey" : {
        "server_public_key" : "some key"
      }
    }
  ]
}

Question is: How to get the nth element of a JSON Array when Decoding with Codable in Swift?

from How to decode JSON Array with different objects with Codable in Swift?