code: public function post($section, $body = null, array $headers = [])
      {
          if (is_array($body)) {
              $body = array_merge($this->parameters, $body, $this->defaultParameters);
  
              $body = http_build_query($body);
          }
  
          return $this->client->post($this->getUrl($section), $headers, $body);
      }
docs: Sends a POST request.
  
  @param string                            $section URI section
  @param string|array|StreamInterface|null $body    Body content or Http post parameters
  @param array                             $headers Http headers
  
  @throws Exception
  
  @return ResponseInterface PSR-7 Response