Postman script to automatically get token and assign it to environment variable

postman_automatic_token.js

/*
 * Postman script to automatically get token and assign it to environment variable
 * - Create new endpoint (GET, POST, etc)
 * - Create an env variable called "access_token"
 * - Add this script in Tests tab in Postman for your newly created endpoint
 * - To debug you can use Postman Console (Alt + Ctrl + C)
 */
const tokenUrl = 'https://mywebsite.com/auth/token';

const apiKey = "123FJSKAHFSAJFHSAFKJSAFHASSAFA";
const apiKeySecret = "456FSAFLKAFAKFJLSFSAJFLKSAJFLKA";

const getTokenRequest = {
  method: 'POST',
  url: tokenUrl,
  header: {
    'MY-CUSTOMER-KEY': apiKey,
    'MY-CUSTOMER-SECOND-KEY': apiKeySecret
  },
  body: {}
};

pm.sendRequest(getTokenRequest, (err, response) => {
  const jsonResponse = response.json();
  const newAccessToken = jsonResponse.token;

  // create a postman environment variable called "access_token"
  // and next code line will set it with retrieved token
  pm.environment.set('access_token', newAccessToken);
});