Immortal_pony

$apiUrl = "https://api.shiptor.ru/public/v1";
$apiKey = "YOUR_KEY";
$client = new \JsonRPC\Client($apiUrl);

// Set headers
$client->getHttpClient()->withBeforeRequestCallback(function(HttpClient $client, $payload) {
    $client->withHeaders([
        "Content-Type: application/json",
        "x-authorization-token: {$apiKey}"
    ]);
});

// Fetch something
$method = "calculateShipping";
$params = ['paramName'=>"paramValue"];
$result = $client->execute($method, $params);