function setUp()
{
$this->protocolVersion = '3.4';
$this->secret = "zpXwe2D77g4P7ysGJcr3rY87TBYs6J";
$this->shopId = '68849';
$this->brand = Verotel\FlexPay\Brand::create_from_name('FreenomPay');
$this->client = new Verotel\FlexPay\Client($this->shopId, $this->secret, $this->brand);
$this->params = array('saleID' => '433456', 'referenceID' => '5566', 'priceAmount' => '0.00', 'referenceID' => 'reference1234', 'priceCurrency' => 'USD', 'custom1' => 'My', 'description' => 'My Dščřčřřěřě&?=blah123', 'subscriptionType' => 'RECURRING', 'period' => 'P1M', 'name' => 'My name', 'trialAmount' => '0.01', 'trialPeriod' => 'P3D', 'backURL' => 'http://backURL.test', 'declineURL' => 'http://declineURL.test', 'cancelDiscountPercentage' => '30', 'blah' => 'something');
$this->signOfFiltered = '77ab6c444044bffc8a925c55d31d342096ef9e72';
$this->signOfAll = '3650ddcc9360de60f4fc78604057c9f3246923cb';
$this->baseUrl = 'https://secure.freenompay.com/';
$this->commonURLParams = "backURL=http%3A%2F%2FbackURL.test" . "&blah=something" . "&cancelDiscountPercentage=30" . "&custom1=My" . "&declineURL=http%3A%2F%2FdeclineURL.test" . "&description=" . "My+D%C5%A1%C4%8D%C5%99%C4%8D%C5%99%C5%99" . "%C4%9B%C5%99%C4%9B%26%3F%3Dblah123" . "&name=My+name" . "&period=P1M" . "&priceAmount=0.00" . "&priceCurrency=USD" . "&referenceID=reference1234" . "&saleID=433456" . "&shopID=68849" . "&subscriptionType=RECURRING" . "&trialAmount=0.01" . "&trialPeriod=P3D";
}
<?php
require_once __DIR__ . '/../src/Verotel/FlexPay/Client.php';
require_once 'config.php';
$brand = Verotel\FlexPay\Brand::create_from_merchant_id($FLEXPAYCONFIG['merchantId']);
$flexpayClient = new Verotel\FlexPay\Client($FLEXPAYCONFIG['shopId'], $FLEXPAYCONFIG['signatureKey'], $brand);
$purchaseUrl = $flexpayClient->get_purchase_URL(["priceAmount" => 2.64, "priceCurrency" => "EUR", "description" => "Test purchase"]);
?>
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<title>Verotel FlexPay - examples</title>
</head>
<body>
<h1>Verotel FlexPay</h1>
<h2>Purchase</h2>
<p>
<a href="<?php
echo htmlspecialchars($purchaseUrl);
?>
">Pay 2.64 EUR</a>
</p>
</body>
</html>