Renew partner subscription

Parameters

Request

<?php
declare(strict_types=1);
class Configuration
{
    public const MERCHANT_CODE = 'MERCHANT';
    public const MERCHANT_KEY = 'SECRET_KEY';
    public const URL = 'http://api.avangate.local/rpc/6.0';
    public const ACTION = 'renewPartnerSubscriptions';
    
    public const PAYLOAD =  <<<JSON
{
    "Items": [
        {
            "SubscriptionReference": "XYZ23GHUJK",
            "Quantity": 5,
            "PricingOptions": [
                {
                    "Code": "option30p"
                },
                {
                    "Code": "option20p"
                }
            ]
        }
    ],
    "ExtraDiscount": {
        "Value": 10,
        "Type": "FIXED"
    },
    "ExtraMargin": {
        "Value": 10,
        "Type": "PERCENT"
    },
    "ExternalReferenceNumber": "EXT-007",
    "Comment": "API partner order for renewal"
}
JSON;
 
}
class Client
{
    private const LOGIN_METHOD = 'login';
    private $calls = 1;
    private $sessionId;

    private function generateAuth(): array
    {
        $merchantCode = Configuration::MERCHANT_CODE;
        $key = Configuration::MERCHANT_KEY;
        $date = gmdate('Y-m-d H:i:s');
        $string = strlen($merchantCode) . $merchantCode . strlen($date) . $date;
        $algo = 'sha256';
        $hash = hash_hmac($algo, $string, $key);

        return compact('merchantCode', 'date', 'hash', 'algo');
    }

    public function login(string $url)
    {
        $payload = $this->generateAuth();
        $response = $this->call($url, array_values($payload), self::LOGIN_METHOD);
        $this->sessionId = $response['result'];
    }

    public function call(
        string $url = Configuration::URL,
        $payload = Configuration::PAYLOAD,
        string $action = Configuration::ACTION
    ): ?array {
        if (empty($this->sessionId) && $action !== self::LOGIN_METHOD) {
            $this->login($url);
        }
        if (is_string($payload)) {
            $payload = json_decode($payload, true);
        }
        if (!empty($this->sessionId)) {
            $payload = [$this->sessionId, $payload];
        }
        $payload = array_filter($payload);
        $request = json_encode([
            'jsonrpc' => '2.0',
            'method'  => $action,
            'params'  => $payload,
            'id'      => $this->calls++,
        ]);
        $curl = curl_init($url);
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($curl, CURLOPT_SSLVERSION, 0);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt(
            $curl,
            CURLOPT_HTTPHEADER,
            ['Content-Type: application/json', 'Accept: application/json', 'Cookie: XDEBUG_SESSION=PHPSTORM']
        );
        curl_setopt($curl, CURLOPT_POSTFIELDS, $request);
        $response = curl_exec($curl);
        if (empty($response)) {
            die('Server unavailable');
        }
        echo $response . '</br>';

        return json_decode($response, true);;
    }
}

$client = new Client();
$result = $client->call();
var_dump($result);