Getting invalid token signature

I created an app and copied the JWT token which is valid for 1 day by going into app credentials section and made a call to create a meeting and successfully got a response. However, when I generate credentials within code using JWT example given here I get an error. Code example -

async function getToken(){
	const APIKey = "API key here";
	const secret = "secret here";
	 const payload = {
	    iss: APIKey,
	    exp: ((new Date()).getTime() + 5000)
	const token = jwt.sign(payload, APISecret);
	return jwt.sign(payload, secret);	

async function createMeeting(token){
	email = "user email here";

	let config = {
	    headers: { Authorization: `Bearer ${token}` }
	let data = {
		  "topic": "test create meeting",
		  "type": 1,
		  "settings": {
		    "host_video": "true",
		    "participant_video": "true"

	let resp = await 
	  "" + email + "/meetings",

	return "done";

async function f(){
	let token = await getToken();
	console.log("token -> ", token);
	await createMeeting(token);


{“code”:124,“message”:“The Token’s Signature resulted invalid when verified using the Algorithm: HmacSHA256”}

Which App Type (OAuth / Chatbot / JWT / Webhook)?

Which Endpoint/s?
Problem exists with all endpoints.

How To Reproduce (If applicable)
Steps to reproduce the behavior:

  1. run the code given above

Screenshots (If applicable)
Steps explain everything I am doing

Additional context

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