Styjun

anyone can help me as I'm stuck to get an tokken from:
https://www.parcel2go.com/api/docs/articles/intro.html

Example Token Request:

POST /auth/connect/token HTTP/1.1
Host: sandbox.parcel2go.com
User-Agent: insomnia/5.14.6
Content-Type: application/x-www-form-urlencoded
Accept: */*
grant_type=client_credentials
 &scope=public-api%20payment
 &client_id=<client_id>
 &client_secret=<client_secret>

Here is a photo from postman where all is working fine:

I have 2 solutions:

Solution number 1:

Here is a server:

const express = require("express");
const app = express();

const ClientOAuth2 = require("client-oauth2");
const p2gAuth = new ClientOAuth2(
 clientId: "52bec26d025a4b8db2248a90da1e455a:testing",
 clientSecret: "testing123",
 accessTokenUri: "https://sandbox.parcel2go.com/auth/connect/token",
 scopes: ["public-api", "payment"]
);

app.get("/api/getToken", (req, res) => 
 p2gAuth.credentials.getToken().then(function(user) 
 console.log(user); //=> accessToken: '...', tokenType: 'bearer', ... 
 );
);

app.listen(3001, () =>
 console.log("Express server is running on localhost:3001")
);

I getting response:

(node:22703) UnhandledPromiseRejectionWarning: Error: Client authentication failed (e.g., unknown client, no client authentication included, or unsupported authentication method).
at getAuthError (/Users/mario/Documents/VS/mario-p2g/node_modules/client-oauth2/src/client-oauth2.js:121:15)
at /Users/Mario/Documents/VS/mario-p2g/node_modules/client-oauth2/src/client-oauth2.js:269:21
at process._tickCallback (internal/process/next_tick.js:68:7)
(node:22703) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2) 
(node:22703) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Solution number 2:

Would someone explain me what to do and the best I would like to know how to use this in fetch request, what is wrong with that code:

const express = require("express");
const app = express();
const fetch = require("node-fetch");

app.get("/api/getToken", (req, res) => 
 fetch("https://sandbox.parcel2go.com/auth/connect/token", 
 method: "POST",
 headers: 
 "User-Agent": "insomnia/5.14.6",
 "Content-Type": "application/x-www-form-urlencoded",
 Accept: "*/*"
 ,
 body: 
 grant_type: "client_credentials",
 client_id: "52bec26d025a4b8db2248a90da1e455a:testing",
 client_secret: "testing123",
 scope: ["public-api", "payment"]
 
 )
 .then(response => response.json())
 .then(body => 
 if (body) 
 res.json(body);
 else 
 res.json( error: "no body after respond" );
 
 )
 .catch(error => 
 res.json(error);
 console.log("Server failed to return data: " + error);
 );
);

app.listen(3001, () =>
 console.log("Express server is running on localhost:3001")
);