$key_sentences = $_POST[key];  //will be the correct answer of a short-answer quest
$target_sentences = $_POST[target]; //will be what the player enters into the textbox
$value = $_POST[value]; //maximum mark value, the return result will be 0 to value. Could be 1 so you will get a number in the range of 0 to 1.
$maxBPM = true;  //use Bipartite Matching algorithm, or false and not pass maxBPM for using v1's conventional keyword matching and distribution method
$language = $_POST[language]; //en, fr, or hi 

// Prepare POST request with the ith key sentence, jth
// target sentence, and the value. The JSON object will
// get sent to a PHP bridge where the similarity between
// the key sentence and target sentence will be calculated
$json = array(
    'key' => $key_sentences,
    'target' => $target_sentences,
    'value' => $value,
    'maxBPM' => $maxBPM,
    'language' => $language
);

$json = json_encode($json);

$context = array('http' =>
    array(
        'method'  => 'POST',
        'header'  => 'Content-Type: application/json',
        'content' => $json
    )
);
$context  = stream_context_create($context);

// use file_get_get_contents or AJAX to send request to WS-NLP service bridge
$contents = file_get_contents('https://ws-nlp.vipresearch.ca/bridge/', false, $context);

// use json_decode to capture response
$contents = json_decode($contents);

// will be the similarity between the key and target text
$contents->similarity; 

// see more JSON structure of the response in the instruction page