.NET WhatsApp API Integration (C# / .NET Core)

Why Zaptilo for .NET in India?

• Native HttpClient integration — no extra NuGet packages needed
• Pay-as-you-go INR pricing — from ₹0.04/message at volume
• Works with .NET Framework 4.6.2+, .NET 6/7/8, ASP.NET Core, Blazor, MAUI
• India-based support, GST-compliant invoicing

Step 1: Create the service class

using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Threading.Tasks;

public class ZaptiloWhatsAppService
{
    private readonly HttpClient _http;
    private readonly string _token;

    public ZaptiloWhatsAppService(HttpClient http, IConfiguration config)
    {
        _http = http;
        _http.BaseAddress = new Uri("https://web.zaptilo.ai/");
        _token = config["Zaptilo:ApiToken"];
        _http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", _token);
    }

    public async Task SendTemplateAsync(string phone, string templateName, string[] bodyValues)
    {
        var parameters = bodyValues.Select(v => new { type = "text", text = v }).ToArray();

        var payload = new
        {
            phone,
            template = new
            {
                name = templateName,
                language = new { code = "en" },
                components = new[] { new { type = "body", parameters } }
            }
        };

        var response = await _http.PostAsJsonAsync("api/send/template", payload);
        response.EnsureSuccessStatusCode();
    }
}

Step 2: Register and configure

// Program.cs (ASP.NET Core 8)
builder.Services.AddHttpClient<ZaptiloWhatsAppService>();

// appsettings.json
{
  "Zaptilo": {
    "ApiToken": "your_api_token_here"
  }
}

Step 3: Send from a controller

[ApiController]
[Route("api/[controller]")]
public class OrdersController : ControllerBase
{
    private readonly ZaptiloWhatsAppService _whatsApp;

    public OrdersController(ZaptiloWhatsAppService whatsApp) => _whatsApp = whatsApp;

    [HttpPost("placed")]
    public async Task<IActionResult> OrderPlaced([FromBody] OrderDto order)
    {
        await _whatsApp.SendTemplateAsync(
            "91" + order.CustomerPhone,
            "order_confirmation",
            new[] { order.CustomerName, order.OrderId }
        );
        return Ok();
    }
}

Use cases for Indian .NET teams

Frequently asked questions