[BotAuthentication(CredentialProviderType = typeof(MultiCredentialProvider))]
    public class RouterController : ApiController
    {
        static readonly ILog Logger = LogManager.GetLogger("RouterController");

        public virtual async Task<HttpResponseMessage> Post([FromBody]Activity activity,

CancellationToken token)
        {
            using (var scope = DialogModule.BeginLifetimeScope(Conversation.Container, activity))
            {
                var connector = scope.Resolve<IConnectorClient>();
                var botHandle = activity.GetBodHandle();
                //...
            }

            var response = Request.CreateResponse(HttpStatusCode.OK);
            return response;
        }
    }


public class MultiCredentialProvider : ICredentialProvider {....}

public static class Extensions
{
   public static string GetBotHandle(this IMessageActivity activity)
   {
      return activity.Recipient.Id.Split('@').First();
   }
}