Braintree\TransactionGateway::cancelRelease PHP Method

    public function cancelRelease($transactionId)
    {
        $this->_validateId($transactionId);
        $path = $this->_config->merchantPath() . '/transactions/' . $transactionId . '/cancel_release';
        $response = $this->_http->put($path, []);
        return $this->_verifyGatewayResponse($response);
    }