https://api.ssg-wsg.sg/courses/runs/331552/sessions?uen=199907030H&courseReferenceNumber=TGS-2020002154<pre>array(2) {
  ["result"]=>
  string(42) "{
    "error": "Certificate has expired"
}"
  ["header_info"]=>
  string(228) "GET /courses/runs/331552/sessions?uen=199907030H&courseReferenceNumber=TGS-2020002154 HTTP/1.1
Host: api.ssg-wsg.sg
Transfer-Encoding: chunked
Accept: application/json
Content-Type: application/json
Expect: 100-continue

"
}
</pre>