Check invoice

$url = ''https://api.passimpay.io/orderstatus' ;
$platform_id = 1 ; // Platform ID
$apikey = '1111-2222-3333-4444-5555' ; // Secret key
$order_id = 1 ; // Payment ID of your platform.

$payload = http_build_query(['platform_id' => $platform_id, 'order_id' => $order_id]);
$hash = hash_hmac( 'sha256' , $payload, $apikey);

$data = [
   'platform_id' => $platform_id,
   'order_id' => $order_id,
   'hash' => $hash,
];

$post_data = http_build_query($data);

$curl = curl_init();
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_HTTPHEADER, ['Content-Type: application/x-www-form-urlencoded']);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $post_data);
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_ENCODING, 'gzip');
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
$result = curl_exec($curl);
curl_close( $curl );

$result = json_decode($result, true);

// Response options
// In case of success
if (isset($result['result']) && $result['result'] == 1)
{
   $status = $result['status']; // paid, error, wait
}
// In case of an error
else
{
   $error = $result['message']; // Error text
}