External Payment Gateway Integration in PHP

external_payment_gateway.php

public function dataJumpseller(Request $data)
    {
        $secretKey = "secreto_jumpseller";

        $params = array( "x_account_id" => "223504", "x_amount" => "123.0", "x_currency" => "EUR", "x_reference" => "1001", , x_result: "completed",  x_timestamp: '2014-03-24T12:15:41Z', "x_message" => "\\nProducto:\\n1 x Energise EDT 125 ML: 29.500 EUR\\nImpuesto: €6.785,00" );

        $keys = array_keys($params);
        sort($keys);

        $toSign = "";
        foreach ($keys as $key) { $toSign .= $key . $params[$key]; }

        $sign = hash_hmac('sha256', $toSign, $secretKey);
        return $sign;
    }