public function doExpressCheckoutPayment($data, $token, $payerid)
    {
        $this->setItemSubTotal($data);

        $this->post = $this->setCartItems($data['items'])->merge([
            'TOKEN'                          => $token,
            'PAYERID'                        => $payerid,
            'PAYMENTREQUEST_0_ITEMAMT'       => $this->subtotal,
            'PAYMENTREQUEST_0_AMT'           => $data['total'],
            'PAYMENTREQUEST_0_PAYMENTACTION' => !empty($this->config['payment_action']) ? $this->config['payment_action'] : 'Sale',
            'PAYMENTREQUEST_0_CURRENCYCODE'  => $this->currency,
            'PAYMENTREQUEST_0_DESC'          => $data['invoice_description'],
            'PAYMENTREQUEST_0_INVNUM'        => $data['invoice_id'],
            'PAYMENTREQUEST_0_NOTIFYURL'     => $this->notifyUrl,
        ]);

        $this->setShippingAmount($data);

        return $this->doPayPalRequest('DoExpressCheckoutPayment');
    }