kofiLambda.cs

    public static class Function1
    {
        [FunctionName("kofi")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function,  "post", Route = null)]
            HttpRequest req,
            ILogger log)
        {

            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
            requestBody = HttpUtility.UrlDecode(requestBody);
            requestBody = requestBody.Split('=').Last();

            log.Log(LogLevel.Information, requestBody);
            var payload = JsonConvert.DeserializeObject<Payload>(requestBody);
            var notificationHubClient = new NotificationHubClient("Endpoint=sb://webhooksample.servicebus.windows.net/;SharedAccessKeyName=DefaultFullSharedAccessSignature;SharedAccessKey=53M3mioz9i1xgReCjJ", "koofihub");
            var notificationResult =
                await notificationHubClient.SendNotificationAsync(
                    new FcmNotification("{\"data\":{\"message\":\"" + payload.Message + "\"}}"));
            log.Log(LogLevel.Information, "Notification delivered to {0} devices and failed {1} devices",
                notificationResult.Success, notificationResult.Failure);
            return new OkObjectResult(new object());
        }
    }
}