Good day!

I've created an url shortener website  (http://tuolink.it) using the google api (not a programmer, found the php code around!)

Then i found this great service and I would like to leave goo.gl API and use shorte.st one.

I'm really lost because, being asimple task for many of you, i'm not a programmer and have no idea where to start!

This is the code i found on github:

<?php 

$curl_url = "https://api.shorte.st/s/CHANGE_TO_YOUR_TOKEN/facebook.com";
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, $curl_url); 
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
$result = curl_exec($ch); 
curl_close($ch); 
$array = json_decode($result);
$shortest = $array->shortenedUrl;

</php>

And this is my page, but i've no idea where to start to replace the goo.gl API with shorte.st one, do you have any idea ?

$confUrl = $conf['url'];

$resultSettings = mysqli_fetch_row(mysqli_query($db, getSettings($querySettings)));

// If captcha is enabled
if($resultSettings[9]) {
    if($_POST['captcha'] !== "{$_SESSION['captcha']}" || empty($_POST['captcha'])) {
        echo '<div class="container-short"><div class="info">Sorry but the captcha is invalid.</div></div>';
        return;
    }
}

$postData = array('longUrl' => $_POST['short'], 'key' => $resultSettings[1]); // prepare the array for JSON encoding
$jsonData = json_encode($postData); // encode to JSON format

$curlObj = curl_init();

curl_setopt($curlObj, CURLOPT_URL, 'https://www.googleapis.com/urlshortener/v1/url?key='.$resultSettings[1]);
curl_setopt($curlObj, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curlObj, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($curlObj, CURLOPT_HEADER, 0);
curl_setopt($curlObj, CURLOPT_HTTPHEADER, array('Content-type:application/json'));
curl_setopt($curlObj, CURLOPT_POST, 1);
curl_setopt($curlObj, CURLOPT_POSTFIELDS, $jsonData);

$response = curl_exec($curlObj);

// JSON string to object format
$json = json_decode($response);
if(empty($json->id)) {
    echo '<div class="container-short"><div class="info">Sorry but the link you have entered is not valid.</div></div>';
    $x = 1;
} else {
    //echo $json->id;
    //echo $json->longUrl;
    $gid = str_replace(array('http://goo.gl/', 'https://goo.gl/'), array('', ''), $json->id); // strip the goo.gl url and get the id alone
    if(ctype_alnum($_POST['custom']) || $_POST['custom'] == '') { // verify if the Alias is only letters+-numbers or if it empty/not set.
        if(!empty($_POST['custom'])) { // verify if the custom input is set
            if(verifyAlias('gid', 'alias', $gid, $_POST['custom']) == 0 && $_POST['custom'] !== 'disclaimer' && $_POST['custom'] !== 'privacy' && $_POST['custom'] !== 'contact' && $_POST['custom'] !== 'admin' && $_POST['custom'] !== 'api' && $_POST['custom'] !== 'welcome' && $_POST['custom'] !== 'tos' && $_POST['custom'] !== 'latest' && $_POST['custom'] !== 'stats' && $_POST['custom'] !== 'short') { // verify if the alias already exists or have the same value as the `gid`
                $query = sprintf("INSERT INTO links (`url`, `gid`, `alias`, `date`) VALUES ('%s', '%s', '%s', '%s')",
                mysqli_real_escape_string($db, $json->longUrl),
                mysqli_real_escape_string($db, $gid),
                mysqli_real_escape_string($db, $_POST['custom']),
                mysqli_real_escape_string($db, date("Y-m-d H:i:s")));
                mysqli_query($db, $query);
            } else {
                echo '<div class="container-short"><div class="info">The current link can\'t have an alias.</div></div>';
                $x = 1;
            }
        } else {
            if(verifyId('gid', $gid) == 0) { // Check if Google Shortened ID exists in the database
                $query = sprintf("INSERT INTO links (`url`, `gid`, `alias`, `date`) VALUES ('%s', '%s', '%s', '%s')",
                mysqli_real_escape_string($db, $json->longUrl),
                mysqli_real_escape_string($db, $gid),
                mysqli_real_escape_string($db, ''),
                mysqli_real_escape_string($db, date("Y-m-d H:i:s")));
                mysqli_query($db, $query);
            }
        }
    } else {
        echo '<div class="container-short"><div class="info">The alias must consist only from letters and numbers.</div></div>';
        $x = 1;
    }
}
mysqli_close($db);
?>
<?php
// OUTPUT THE RESULT
if($x !== 1) { // Check if there is no error to display the content
    echo '<div class="container-short"><div class="short-container" id="focus">';
        if(!empty($_POST['custom'])) {
            echo '<div class="text-inputs">Url Personalizzato:</div><input class="select" type="text" value="'.$confUrl.'/'.$_POST['custom'].'" readonly="readonly" /><br />';
        }
        echo '<div class="text-inputs">Url Abbreviato:</div><input class="select" type="text" value="'.$confUrl.'/'.$gid.'" readonly="readonly" /><br />';
   
               
   
        echo '<div class="text-inputs">Url Originale:</div><input class="select" type="text" value="'.$json->longUrl.'" readonly="readonly" /><br />';
        echo '<div class="text-inputs">Codice QR</div><img src="http://chart.googleapis.com/chart?cht=qr&chs=150x150&choe=UTF-8&chld=H|0&chl='.$confUrl.'/'.$gid.'" />';
    echo '</div></div>';
}