DEBUG: Cache is NOT active
DEBUG: try to retieve this url: https://dxp.securustech.net/api/jsonws/journal.journalarticle/get-article-by-url-title/group-id/20121/url-title/product-terms-conditions
DEBUG: wp_remote_get to https://dxp.securustech.net/api/jsonws/journal.journalarticle/get-article-by-url-title/group-id/20121/url-title/product-terms-conditions
DEBUG: arguments: Array ( [timeout] => 5 )
DEBUG: error getting URL:cURL error 6: Could not resolve host: dxp.securustech.net
DEBUG: no data received: check url of json-feed

EMPTY api-answer: No JSON received - is the API down? Check the URL you use in the shortcode!