You can retrieve data by sending an HTTPS GET or POST request to the URI with the appropriate (query string) parameters.
Chapter Parameters lists all the available parameters you can use.
Example:
The following API call will retrieve the monthly import value from January 2016 to June 2016 for Germany and Switzerland for HS Codes 8401 and 2703 in JSON format (if the following API Token was valid – the one below is not valid).
https://www.globaltradetracker.com/api/rest/getreport?token=NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN&impexp=I&periodtype=M&from=2016-01&to=2016-06&reporter=DE%2CCH&source=DEFAULT&hscode=8401%2C2703&hslevel=0&layout=brief&format=json