Telegram\Bot\Api::post PHP Method

    protected function post($endpoint, array $params = [], $fileUpload = false)
    {
        if ($fileUpload) {
            $params = ['multipart' => $params];
        } else {
            if (array_key_exists('reply_markup', $params)) {
                $params['reply_markup'] = (string) $params['reply_markup'];
            }
            $params = ['form_params' => $params];
        }
        return $this->sendRequest('POST', $endpoint, $params);
    }