using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json; // Install via NuGet

class Program
{
    static async Task Main(string[] args)
    {
        string apiKey = "your_api_key_here";
        string url = "https://app.rapiwa.com/send-message";

        var payload = new
        {
            number = "8801234567890",
            message = "Hello from RapiwaApi!"
        };

        using (var client = new HttpClient())
        {
            client.DefaultRequestHeaders.Add("Authorization", $"Bearer {apiKey}");

            var json = JsonConvert.SerializeObject(payload);
            var content = new StringContent(json, Encoding.UTF8, "application/json");

            HttpResponseMessage response = await client.PostAsync(url, content);

            if (response.IsSuccessStatusCode)
            {
                string responseContent = await response.Content.ReadAsStringAsync();
                Console.WriteLine("Message sent successfully:");
                Console.WriteLine(responseContent);
            }
            else
            {
                Console.WriteLine($"Failed to send message. Status: {response.StatusCode}");
                string errorContent = await response.Content.ReadAsStringAsync();
                Console.WriteLine("Error:", errorContent);
            }
        }
    }
}