Last modified: May 28, 2024


How to create custom SMS notifications for apps.

Activate generation of SMS notifications in your application

The SMS client is automatically added to the application. To use it, inject the IEmailNotificationClient-interface. The interface defines a method used to order an email notification from the Altinn Notifications API.

Code example

Below we see an example of trying to send a SMS notification when a user starts to fill out a form, by using the IProcessTaskStart interface.

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Altinn.App.Core.Features;
using Altinn.App.Core.Internal.Notifications.Sms;
using Altinn.App.Core.Models.Notifications.Sms;
using Altinn.Platform.Storage.Interface.Models;
using Microsoft.Extensions.Logging;

namespace Altinn.App.Core;

public class SmsOnStart(ILogger<SmsOnStart> logger, ISmsNotificationClient smsNotificationClient)
    : IProcessTaskStart
    public async Task Start(string taskId, Instance instance, Dictionary<string, string> prefill)
        // "Task_1" is the name of the schema step in the bpmn process
        if (taskId != "Task_1")

            var order = new SmsNotification
                SenderNumber = "<sender>",
                Body = "You started filling out a form",
                SendersReference = "<my-schema-ref>",
                Recipients = [new("0047XXXXXXXX")],
            using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
            var orderResult = await smsNotificationClient.Order(order, default);
                "Task started, SMS sent to {MobileNumber} - OrderId={OrderId}",
        catch (SmsNotificationException e)
            logger.LogError(e, "Error sending SMS on task start");

Then we have to register the SmsOnStart class as IProcessTaskStart in Program.cs.

using Altinn.App.Core;
using Altinn.App.Core.Features;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

void RegisterCustomAppServices(IServiceCollection services, IConfiguration config, IWebHostEnvironment env)
    services.AddSingleton<IProcessTaskStart, SmsOnStart>();