Retrieve partner subscription upgrade price

Request parameters

Parameter	Type / Description
sessionID	String (Required) Session identifier, output of the Login method. An exception is thrown if the values are incorrect.
Items	Object (Required) Details below.
Items.SubscriptionReference	String (Required) The 2Checkout unique subscription code.
Items.UpgradeProductCode	String (Required) Unique product identifier code of the product you wish the subscription to be upgraded to.
Items.Quantity	String (Required) Defines the amount of product units to be upgraded to.
Items.PricingOptions	Object (Required) Details below.
Items.PricingOptions.Code	String (Required) The 2Checkout unique pricing code.
ExtraDiscount	Object (Optional) Details below.
ExtraDiscount.Value	String (Optional) Extra discount you offer to partner orders.
ExtraDiscount.Type	String (Optional) Possible values: FIXED or PERCENT.
ExtraMargin	Object (Optional) Details below.
ExtraMargin.Value	String (Optional) Extra margin you offer to partner orders.
ExtraMargin.Type	String (Optional) Possible values: FIXED or PERCENT.

Request sample

<?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 = 'getPartnerSubscriptionsUpgradePrice';
    
    public const PAYLOAD =  <<<JSON
{
    "Items": [
        {
            "SubscriptionReference": "XYZ23GHUJK",
            "UpgradeProductCode": "Avangate",
            "Quantity": 5,
            "PricingOptions": [
                {
                    "Code": "option30p"
                },
                {
                    "Code": "option20p"
                }
            ]
        }
    ],
    "ExtraDiscount": {
        "Value": 10,
        "Type": "FIXED"
    },
    "ExtraMargin": {
        "Value": 10,
        "Type": "PERCENT"
    }
}
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);