Google Sheets to output variable to Discord - google-apps-script

Question

I am attempting to create a script that outputs a cell in the same row to discord based on a checkbox. I've written up so far the following, although I'm really not very good with javascript/Google Script. I cannot get past the auth requirements and do not see the mistake I am making.
const sheet = SpreadsheetApp.getActiveSpreadsheet()
function onEdit(e) {
var discordUrl = "Webhook";
var userName = 3
var channelMsg = userName
let checkboxColumnNo = 5
let range = e.range;
let value = range.getValue().toString();
let column = range.getColumn();
let row = range.getRow();
let sheetName = range.getSheet().getName()
if (column == checkboxColumnNo && value === "true") {userName;
}
var payload = JSON.stringify({content: "Whitelist add " + channelMsg });
var params = {headers: {'Content-Type': 'application/json','Accept': 'application/json'}, method: "POST",payload: payload,muteHttpExceptions: true};
var response = UrlFetchApp.fetch(discordUrl, params);
Logger.log(response.getContentText());
Logger.log(payload);
Logger.log(channelMsg);;
}
Just showing what my sheet layout looks like.

Answer 1

Comparing your code with something very similar that I've done I can only spot 1 difference which is the following:
Your code:
var params = {headers: {'Content-Type': 'application/json','Accept': 'application/json'}, method: "POST",payload: payload,muteHttpExceptions: true};
My code:
var params = {
headers: {
'Content-Type': 'application/json'
},
method: "POST",
payload: payload,
muteHttpExceptions: true
};
Difference:
In your header you have this which I don't, try removing it to see if it works.
'Accept': 'application/json'
Little bonus, here's a tool I use to make nice embedded messages for Discord:
https://leovoel.github.io/embed-visualizer/