error

[sudohunter]

/run

$postfields = array(
    'username' => '******',
    'password' => '******',
    'action' => 'GetClients',
    'responsetype' => 'json',
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://******/includes/api.php');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postfields));
$response = curl_exec($ch);
if (curl_error($ch)) {
    die('Unable to connect: ' . curl_errno($ch) . ' - ' . curl_error($ch));
}
curl_close($ch);
$jsonData = json_decode($response, true);
var_dump($jsonData);

result : 
array(2) {
  ["result"]=>
  string(5) "error"
  ["message"]=>
  string(26) "Invalid IP *****"
}

[steven99]

You need to add the IP your connecting from to the API allow list in General settings -> security -> API IP Access Restriction