# Create fixed discount

Use **setPromotionDiscount** to set a fixed promotion discount.

## Request parameters

<table><thead><tr><th width="410.2667236328125">Parameter</th><th>Type / Description</th></tr></thead><tbody><tr><td><code>sessionID</code></td><td><strong>Required (string)</strong><br>Output of the <strong>Login</strong> method.</td></tr><tr><td><code>promotionCode</code></td><td><strong>Required (string)</strong><br>The code corresponding to the promotion that you want to set the discount for.</td></tr><tr><td><code>promotionDiscount</code></td><td><strong>Required (object)</strong></td></tr><tr><td><code>promotionDiscount.Type</code></td><td><p><strong>Required (string)</strong></p><p>Discount type:</p><ul><li>PERCENT, use in combination with <code>Value</code></li><li>FIXED, use in combination with <code>Values</code> and <code>DefaultCurrency</code></li></ul></td></tr><tr><td><code>promotionDiscount.Value/Values</code></td><td><p><strong>Required</strong> <strong>(int / array of objects)</strong></p><ul><li>Value = Int, determines the discount percentage from 0 to 100</li><li>Values = Array of Value objects</li></ul></td></tr><tr><td><code>promotionDiscount.Value/Values.Value</code></td><td><strong>Required (object)</strong></td></tr><tr><td><code>promotionDiscount.Value/Values.Value.Currency</code></td><td><strong>Required (string)</strong><br>Discount currency ISO code (ISO 4217).</td></tr><tr><td><code>promotionDiscount.Value/Values.Value.Amount</code></td><td><strong>Required (int)</strong><br>Discount amount in corresponding currency.</td></tr><tr><td><kbd>promotionDiscount.DefaultCurrency</kbd></td><td><strong>Required (string)</strong><br>Default discount currency ISO code (ISO 4217).</td></tr></tbody></table>

### Request sample

```php
<?php
declare(strict_types=1);

class Configuration
{
    public const MERCHANT_CODE = '';
    public const MERCHANT_KEY = '';
    public const URL = 'http://api.2checkout.com/soap/6.0';
    public const ACTION = 'setPromotionDiscount';
    public const PROMOTION_CODE = "AB3WMME0UA";
    //array or JSON
    public const PAYLOAD = <<<JSON
{
  "Type": "FIXED",
  "DefaultCurrency": "USD",
  "Values": [\
    {\
        "Currency": "USD",\
        "Amount": 10\
    },\
    {\
        "Currency": "EUR",\
        "Amount": 10\
    }\
  ]
}
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;
        $hash = hash_hmac('md5', $string, $key);

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

    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,
        string $promotionCode = Configuration::PROMOTION_CODE
    ): ?array {
        if (empty($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, $promotionCode, $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, array('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);
```

## Response parameters

<table><thead><tr><th width="188.39990234375">Parameter</th><th>Type</th></tr></thead><tbody><tr><td><code>promotionDiscount</code></td><td><strong>Object</strong></td></tr></tbody></table>


---

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