fire and forget with zapier?

fireAndForget.js

let endpoint = `https://dm3.mixpanel.org/refreshDungeon`
let auth = `Bearer ${inputData.token}`
let dungeon = inputData.dungeon

let opts = {
  method: "POST",
  body: dungeon,
  headers: {
    "Content-Type" : "application/json",
    "Authorization" : auth
  }  
}

//don't wait for a value; return immediately
var callback = (err, output)=>{return {foo: `bar`}}

let done = fetch(endpoint, opts).then((err, output)=> callback).catch((err, output)=> callback);

let output = {foo: `bar`};