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Hey @Phong Vu My bad. How can I get access token using refresh token using client ID and client secrete. or any other all possible way. Can you please suggest/share with me.

Thanks

var endpoint = '/restapi/oauth/token'
var url = 'platform.devtest.ringcentral.com'
var basic = [RC_CLIENT_ID] + ":" + [RC_CLIENT_SECRET]
var headers = {
       'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
       'Accept': 'application/json',
       'Authorization': 'Basic ' + Buffer.from(basic).toString('base64')
    }
var body = querystring.stringify({
             'grant_type' : 'refresh_token',
             'refresh_token' : 'REFRESH_TOKEN'
           })
var options = {host: url, path: endpoint, method: 'POST', headers: headers}

// Make an HTTPS POST request with the params above

@Phong Vu Thank You for solution