Webhook pending and payload formatter

Hello, I am new into setting LoRa sensors. I have created device gateway and managed to connect the sensors. I want to use ThingSpeak to record the data and do analysis.
Screen Shot 2021-12-23 at 2.40.11 pm
Screen Shot 2021-12-23 at 2.31.49 pm
First issue: I have webhook pending? Have miss a step?
Second question: Payload formatter: I am planning to use the following javascript:
function Decoder(b,port)(input){
var mytime = ((bytes[3] << 24) | (bytes[2] << 16) | (bytes[1] << 8) | bytes[0] );
var Temp = ((bytes[5] << 8) | bytes[4];
var Humi = ((bytes[7] << 8) | bytes[6];
Not sure if I have the bytes correct. Thank you for your help.
Screen Shot 2021-12-23 at 2.40.11 pm
I just look at the detail event it shows the following error:
@type": “type.googleapis.com/google.protobuf.Struct”,
“value”: {
“body”: “{“success”:false,“error”:{“message”:“Alias uplinks not found”,“id”:null}}”,
“status_code”: 404,
“url”: “https://webhook.site/uplinks”,
“webhook_id”: “XXXXwebhook”