Create a network protocol which will be the blue print of all API methods. This file also has a network error Error type which provides possible fails of the API.

NetworkingController.swift

protocol NetworkingController {
    func loginUser(request:LoginRequest,completion:@escaping(_ result:Result<LoginResponse,NetworkControllerError>) -> Void)
    func forgotPassword(request:ForgotPasswordRequest,completion:@escaping(_ result:Result<ForgotPwdResponse,NetworkControllerError>) -> Void)
}

enum NetworkControllerError:Error {
    case Non200StatusCodeError(NetworkError)
    case NoNetworkError
    case BadURLError
    case UnParsableError
    case UnknownError
    case NoDataAvailableInResponseError
    case customError(message:String)
}

struct NetworkError:Decodable {
    let message:Bool?
    let error:String?
}