Below is sample script Script to retrieve Access and Refresh tokens using GlideOAuthClient libraries

This could be run from background scripts for testing purpose

Code to retrieve Access token and Refresh Token:

var oAuthClient = new sn_auth.GlideOAuthClient();
var requestor_context = 'test';
var requestor_id = 'abc@xyz.com';
var oauth_profile_id = '43d6bab3db849f009a6ff9b61d961957'; // profile ID [sys_id of  'OAuth Entity Profiles' (oauth_entity_profile) record in OAUTH registry  record]

var params = {grant_type:"password", username:'admin', password:'pwd', oauth_requestor_context:requestor_context, oauth_requestor:requestor_id, oauth_provider_profile:oauth_profile_id}; //
var json = new global.JSON();
var text = json.encode(params);
var tokenResponse = oAuthClient.requestToken('oAuth Test', text); //'oAuth Test' is the name of the OAuth application registry record (oauth_entity)
var token = tokenResponse.getToken();
var access_token = token.getAccessToken() ;

gs.log("AccessToken:" + access_token);
gs.log("AccessTokenExpiresIn:" + token.getExpiresIn());
gs.log(" RefreshToken:" + token.getRefreshToken());


Code to retrieve a new Access Token using Refresh token

var oAuthClient = new sn_auth.GlideOAuthClient();
var requestor_context = 'test';
var requestor_id = 'abc@xyz.com';
var oauth_profile_id = '43d6bab3db849f009a6ff9b61d961957'; // profile ID [sys_id of  'OAuth Entity Profiles' (oauth_entity_profile) record in OAUTH registry  record]

var params = {grant_type:"refresh_token", refresh_token:"<value_of_refresh_token>", oauth_requestor_context:requestor_context, oauth_requestor:requestor_id, oauth_provider_profile:oauth_profile_id};
var json = new global.JSON();
var text = json.encode(params);
var tokenResponse = oAuthClient.requestToken('oAuth Test', text); //'oAuth Test' is the name of the OAuth application registry record (oauth_entity)
var token = tokenResponse.getToken();
var access_token = token.getAccessToken() ;

gs.log("AccessToken:" + access_token);
gs.log("AccessTokenExpiresIn:" + token.getExpiresIn());gs.log(" RefreshToken:" + token.getRefreshToken());

Making an outbound REST call with the retrieved token

// make the outbound REST call with the retrieved token