CURL *hnd = curl_easy_init();

curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://partamon-api.herokuapp.com/sync/weather_station");

struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "Postman-Token: d77a9591-e5e3-4dbf-aeb5-d9205ce767c1");
headers = curl_slist_append(headers, "Cache-Control: no-cache");
headers = curl_slist_append(headers, "Content-Type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);

curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "parametro=valor_parametro_aqui");

CURLcode ret = curl_easy_perform(hnd);