CX Authentication sample as pre-request script on postman (urlencoded)

postmanAuthenticationPreRequest.js

const echoPostRequest = {
  url: pm.collectionVariables.get("authUrl"),
  method: "POST",
  header: {
    "content-type": "application/x-www-form-urlencoded",
  },
  body: {
    mode: "urlencoded",
    urlencoded: [
      {
        key: "username",
        value: pm.collectionVariables.get("username"),
        disabled: false,
      },
      {
        key: "password",
        value: pm.collectionVariables.get("password"),
        disabled: false,
      },
      { key: "acr_values", value: pm.collectionVariables.get("acrValues"), disabled: false },
      { key: "scope", value: pm.collectionVariables.get("scope"), disabled: false },
      { key: "client_id", value: pm.collectionVariables.get("clientId"), disabled: false },
      { key: "grant_type", value:pm.collectionVariables.get("grantType"), disabled: false },
    ],
  },
};

var getToken = true;

if (
  !pm.collectionVariables.get("accessTokenExpiry") ||
  !pm.collectionVariables.get("currentAccessToken")
) {
  console.log("Token or expiry date are missing");
} else if (
  pm.collectionVariables.get("accessTokenExpiry") <= new Date().getTime()
) {
  console.log("Token is expired");
} else {
  getToken = false;
  console.log("Token and expiry date are all good");
}

if (getToken === true) {
  pm.sendRequest(echoPostRequest, function (err, res) {
    console.log(err ? err : res.json());
    if (err === null) {
      console.log("Saving the token and expiry date");
      var responseJson = res.json();
      pm.collectionVariables.set(
        "currentAccessToken",
        responseJson.access_token
      );

      var expiryDate = new Date();
      expiryDate.setSeconds(expiryDate.getSeconds() + responseJson.expires_in);
      pm.collectionVariables.set("accessTokenExpiry", expiryDate.getTime());
    }
  });
}