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PHP


<?php
echo "<pre>";
$host   = "https://api.avangate.com";
$client = new SoapClient($host . "/soap/3.0/?wsdl", array(
    'location' => $host . "/order/3.0/soap",
    "stream_context" => stream_context_create(array(
        'ssl' => array(
            'verify_peer' => false,
            'verify_peer_name' => false
        )
    ))
));

function hmac($key, $data)
{
    $b = 64; // byte length for md5
    if (strlen($key) > $b) {
        $key = pack("H*", md5($key));
    }
    
    $key    = str_pad($key, $b, chr(0x00));
    $ipad   = str_pad('', $b, chr(0x36));
    $opad   = str_pad('', $b, chr(0x5c));
    $k_ipad = $key ^ $ipad;
    $k_opad = $key ^ $opad;
    return md5($k_opad . pack("H*", md5($k_ipad . $data)));
}
$merchantCode = "MERCHANT_CODE";// your account's merchant code available in the 'System settings' area of the cPanel: https://secure.avangate.com/cpanel/account_settings.php
$key = "SECRET_KEY";// your account's secret key available in the 'System settings' area of the cPanel: https://secure.avangate.com/cpanel/account_settings.php
$now = date('Y-m-d H:i:s'); //date_default_timezone_set('UTC')
$string = strlen($merchantCode) . $merchantCode . strlen($now) . $now;
$hash   = hmac($key, $string);
try {
    $sessionID = $client->login($merchantCode, $now, $hash);
}
catch (SoapFault $e) {
    echo "Authentication: " . $e->getMessage();
    exit;
}
$orderReference = '45452071';
try {
    $validOrderRef = $client->isValidOrderReference($sessionID, $orderReference);
}
catch (SoapFault $e) {
    echo "validOrderRef: " . $e->getMessage();
    exit;
}
var_dump("validOrderRef", $validOrderRef);
try {
    $existentOrder = $client->getOrder($sessionID, $orderReference);
}
catch (SoapFault $e) {
    echo "existentOrder: " . $e->getMessage();
    exit;
}
$Order = new stdClass();
$Order->RefNo = NULL;
$Order->Currency = 'usd';
$Order->Country = 'US';
$Order->Language = 'en';
$Order->CustomerIP = '91.220.121.21';
$Order->ExternalReference = NULL;
$Order->Source = NULL;
$Order->AffiliateId = NULL;
$Order->CustomerReference = NULL;
$Order->Items = array();
$Order->Items[0] = new stdClass();
$Order->Items[0]->Code = 'my_subscription_1';
$Order->Items[0]->Quantity = 1; 
$Order->Items[0]->PriceOptions = NULL;
$Order->Items[0]->SKU = NULL;
$Order->Items[0]->Price = NULL;
$Order->Items[0]->CrossSell = NULL;
$Order->Items[0]->Trial = false; 
$Order->Items[0]->AdditionalFields = NULL;
$Order->Items[0]->Promotion = NULL;
$Order->BillingDetails = new stdClass();
$Order->BillingDetails = $existentOrder->BillingDetails;
$Order->DeliveryDetails = NULL;
$Order->PaymentDetails = new stdClass ();
$Order->PaymentDetails->Type = 'PREVIOUS_ORDER';
$Order->PaymentDetails->Currency = 'usd';
$Order->PaymentDetails->PaymentMethod = new stdClass ();
$Order->PaymentDetails->CustomerIP = '10.10.10.10';
$Order->PaymentDetails->PaymentMethod->RecurringEnabled = true;
$Order->PaymentDetails->PaymentMethod->RefNo = $orderReference;
$Order->Promotions = NULL;
$Order->AdditionalFields = NULL;
$Order->LocalTime = NULL;
$Order->GiftDetails = NULL;
try {
    $newOrderPaidWithPreviousRef = $client->placeOrder($sessionID, $Order);
}
catch (SoapFault $e) {
    echo "newOrderPaidWithPreviousRef: " . $e->getMessage();
    exit;
}
var_dump("newOrderPaidWithPreviousRef", $newOrderPaidWithPreviousRef);
?>