src/Message/DownloadBillRequest.php
public function sendData($data)
    {
        $responseData = $this->post($this->endpoint, $data, 120);

        return $this->response = new DownloadBillResponse($this, $responseData);
    }
public function sendData($data)
    {
        $responseData = $this->post($this->endpoint, $data, 120);

        return $this->response = new DownloadBillResponse($this, $responseData);
    }
Send the request with specified data

@param  mixed $data The data to send

@return ResponseInterface