php oauth example

callback.php

<pre>
<?php 
$client_id = 'sq0idp-xxx';
$client_secret = 'sq0csp--xxxx';
$redirect_uri= "http://localhost:8080/callback.php";
$authorization_code = $_GET['code'];

if(!$authorization_code){
    die('something went wrong!');
}

$url = 'https://connect.squareup.com/oauth2/token';
$data = array(
    'client_id' => $client_id,
    'client_secret' => $client_secret,
    'redirect_uri' => $redirect_uri,
     'code' => $authorization_code
 );

$options = array(
    'http' => array(
        'header'  => "Content-type: application/json\r\n",
        'method'  => 'POST',
        'content' => json_encode($data)
    )
);
$context  = stream_context_create($options);
$result = file_get_contents($url, false, $context);

echo "Result from /oauth2/token:<br>";
var_dump($result);

$access_token = json_decode($result)->access_token;


//Refresh the token
$url = "https://connect.squareup.com/oauth2/clients/$client_id/access-token/renew";
$data = array(
    'access_token' => $access_token
 );

$options = array(
    'http' => array(
        'header'  => "Content-type: application/json\r\n".  
        "Authorization: Client $client_secret\r\n",
        'method'  => 'POST',
        'content' => json_encode($data)
    )
);

$context  = stream_context_create($options);
$result = file_get_contents($url, false, $context);

echo "Result from /oauth2/clients/$client_id/access-token/renew:";
var_dump($result);

//Revoke the token
$url = "https://connect.squareup.com/oauth2/revoke";
$data = array(
    'access_token' => $access_token,
    'client_id' => $client_id
 );

$options = array(
    'http' => array(
        'header'  => "Content-type: application/json\r\n".  
        "Authorization: Client $client_secret\r\n",
        'method'  => 'POST',
        'content' => json_encode($data)
    )
);

$context  = stream_context_create($options);
$result = file_get_contents($url, false, $context);

echo "Result from /oauth2/revoke:";
var_dump($result);
?>
<a href="https://connect.squareup.com/oauth2/authorize?client_id=<?php echo $client_id;?>">Authorize App</a>