Postman OAuth2 - Basic Authentication

postman-pre-request.js

const clientId = pm.variables.get('clientId');
const oauthUser = pm.variables.get('oauthUser'); // user name or email
const oauthPassword = pm.variables.get('oauthPassword'); // user password
const scope = pm.variables.get('scope'); // "profile"
const accessTokenURL = pm.variables.get('accessTokenURL'); // token url


const getTokenRequest = {
    method: 'POST',
    url: accessTokenURL,
    header: 'Content-Type:application/x-www-form-urlencoded',
    body: {
        mode: 'urlencoded',
        urlencoded: [
            { key: "client_id", value: clientId },
            { key: "username", value: oauthUser },
            { key: "password", value: oauthPassword },
            { key: "grant_type", value: "password" }
        ]
    }
};

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

    console.log({ err, jsonResponse, newAccessToken })

    pm.environment.set('OAuthToken', newAccessToken);
    pm.variables.set('OAuthToken', newAccessToken);
});