https://svc.niceapi.co.kr:22001/digital/niceid/oauth/oauth/token<br/>array(2) {
  [0]=>
  string(47) "Content-Type: application/x-www-form-urlencoded"
  [1]=>
  string(113) "Authorization: Basic OGI0NGUzZmMtYTM5ZC00NGZkLWFkYTEtMmQ1YzZlZGJmZGEyOjg3ZmExNjM0ZjA1OGE0YzYzOWVlMGMwOTQ2NTFkMjYx"
}
<br/>array(2) {
  ["grant_type"]=>
  string(18) "client_credentials"
  ["scope"]=>
  string(7) "default"
}
<br/></br>{"dataHeader":{"GW_RSLT_CD":"1200","GW_RSLT_MSG":"오류 없음"},"dataBody":{"access_token":"50eec3cd-d623-4010-b156-ae87ad97e5c3","token_type":"bearer","expires_in":1463988958,"scope":"default"}}<br/>access_token : 50eec3cd-d623-4010-b156-ae87ad97e5c3</br>