Set up of kolonial client

CreateKolonialHttpClientAsync.csx

public static async Task<HttpClient> CreateKolonialHttpClientAsync(){
    var httpClient = new HttpClient();
    
    // The kolonial API requires a client token and a user agent (supplied by kolonial) to work
    httpClient.DefaultRequestHeaders.Add("X-Client-Token", ConfigurationManager.AppSettings["KolonialToken"]);
    httpClient.DefaultRequestHeaders.Add("User-Agent", ConfigurationManager.AppSettings["KolonialUserAgent"]);
    
    // Modifying the cart requires a valid, active session
    string sessionId = await GetSessionIdAsync(httpClient); 
    
    // Ensure the session cookie is sent as part of the calls to the API.
    httpClient.DefaultRequestHeaders.Add("Cookie", $"sessionid={sessionId}");
    return httpClient;
}


public static async Task<string> GetSessionIdAsync(HttpClient httpClient)
{
    // The session cookie ID is retrieved by passing an object like { username: "something", password: "something-secure" }
    // to the user/login endpoint
    var result = await httpClient.PostAsync("https://kolonial.no/api/v1/user/login/", 
        new StringContent(
            JsonConvert.SerializeObject(
                new { username = "an-email-address", password = "a-password" }),
                 Encoding.UTF8, "application/json"));
    result.EnsureSuccessStatusCode();
    var json = await result.Content.ReadAsStringAsync();
    var response = JsonConvert.DeserializeObject<LogInResponse>(json);
    return response.sessionid;   
}