Whatsapps OTP verification implemented in .net core API

Question

Sarthak Varshney · Answer

WhatsApp's OTP verification in a .NET Core API, you'll need to use the Twilio API for WhatsApp, as WhatsApp does not provide a direct API for OTP verification. Twilio provides a way to send messages to WhatsApp numbers, which can be used for OTP verification. Set up a Twilio account: Sign up for a Twilio account if you don't have one already. Obtain Twilio API credentials: Get your Account SID and Auth Token from the Twilio console. Install Twilio NuGet package: Install the Twilio NuGet package in your .NET Core API project. dotnet add package Twilio Send OTP via WhatsApp using Twilio : using System; using Twilio; using Twilio.Rest.Api.V2010.Account; using Twilio.Types; public class OtpService { public void SendOtpViaWhatsApp(string toPhoneNumber, string otp) { // Twilio credentials string accountSid = "your_account_sid"; string authToken = "your_auth_token"; // Initialize Twilio client TwilioClient.Init(accountSid, authToken); // Message body string messageBody = $"Your OTP for verification is: {otp}"; // Send message via WhatsApp MessageResource.Create( from: new PhoneNumber("whatsapp: "), to: new PhoneNumber($"whatsapp:{toPhoneNumber}"), body: messageBody ); } } Call the SendOtpViaWhatsApp method with the recipient's phone number and the OTP to send the OTP message . string recipientPhoneNumber = "recipient_phone_number"; string otp = "123456"; // Replace with your OTP var otpService = new OtpService(); otpService.SendOtpViaWhatsApp(recipientPhoneNumber, otp); Ensure you have configured your Twilio WhatsApp sandbox : Set up your sandbox by sending "join " to the WhatsApp number provided in your sandbox settings. Configure the incoming message webhook for your sandbox in the Twilio console to point to your API endpoint.