api-auto-postman.js

const defaults = {
    // username: '',
    grant_type: 'client_credentials',
    tokenRoute: "oauth/v2/token"
}

const credentials = {
    dev: {
        url: 'http://',
        client_id: '',
        client_secret: ''
    },
    int: {
        url: 'http://',
        client_id: '',
        client_secret: ''
    },
    recette: {
        url: 'http://',
        client_id: '',
        client_secret: ''
    },
    preprod: {
        url: 'http://',
        client_id: '',
        client_secret: ''
    },
    prod: {
        url: 'http://',
        client_id: '',
        client_secret: ''
    },
}

const formdata = {
    ...credentials[pm.environment.name || 'int'],
    ...defaults
}

const { url, tokenRoute } = formdata
pm.variables.set('endpoint', url);

delete formdata['url']
delete formdata['tokenRoute']

const getTokenRequest = {
  method: 'POST',
  url: `${url}/${tokenRoute}`,
  body: {
      mode: 'formdata',
      formdata: Object.entries(formdata).map(([k, v]) => ({'key': k, 'value': v}))
  }
};

pm.sendRequest(getTokenRequest, (err, response) => {
    const {code, status} = response
    if (code > 400) {
        throw new Error(JSON.stringify({code, status}))
    }
    const jsonResponse = response.json();
    const newAccessToken = jsonResponse.access_token;

    pm.variables.set('access_token', newAccessToken);
});