MessagingFunction.cs

public static class MessagingFunction
{
    [FunctionName("MessagingFunction")]
    public static async Task<object> Run([HttpTrigger(WebHookType = "")]HttpRequestMessage req, TraceWriter log)
    {
        string jsonContent = await req.Content.ReadAsStringAsync();
        var payload = PayloadHelper.GetPayload(WebUtility.UrlDecode(jsonContent));
        if (string.IsNullOrWhiteSpace(payload))
        {
            return req.CreateResponse(HttpStatusCode.BadRequest, new { error = "Invalid payload format" });
        }

        var payloadObject = JObject.Parse(payload);
        var selectedValue = payloadObject["actions"][0].Value<bool>("value");
        var userName = payloadObject.SelectToken("user.name").Value<string>();

        RedisCacheProvider cacheProvider = new RedisCacheProvider();
        var currentLunch = cacheProvider.Get<IList<LunchMember>>("lunch", () => { return new List<LunchMember>(); });
        currentLunch.Add(new LunchMember { Name = userName, IsAccepted = selectedValue });
        cacheProvider.Set<IList<LunchMember>>("lunch", currentLunch);

        return req.CreateResponse(HttpStatusCode.OK, new
        {
            text = selectedValue ? ":yum: *Ağzının tadını biliyorsun!*" : ":weary: *E ne yapalım, bir sonraki sefere artık!*"
        });
    }
}