Untitled

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Amazon.SimpleNotificationService;
using Amazon.SimpleNotificationService.Model;

public class SnsPublisher
{
    public static async Task PublishMessageAsync()
    {
        // Initialize the SNS client
        var snsClient = new AmazonSimpleNotificationServiceClient();

        // Create a publish request with message attributes
        var publishRequest = new PublishRequest
        {
            TopicArn = "arn:aws:sns:us-east-1:123456789012:MyTopic", // replace with your SNS Topic ARN
            Message = "Hello, this is a test notification!",
            MessageAttributes = new Dictionary<string, MessageAttributeValue>
            {
                { "channel", new MessageAttributeValue {
                      DataType = "String",
                      StringValue = "email" // could be "sms" or "push" based on user preferences
                  } }
            }
        };

        // Publish the message to SNS
        var response = await snsClient.PublishAsync(publishRequest);
        Console.WriteLine("Message published with ID: " + response.MessageId);
    }
}