code: public function chargesList($state = null, $skip = null, $limit = null, $expand = null)
      {
          list($response) = $this->chargesListWithHttpInfo($state, $skip, $limit, $expand);
          return $response;
      }
docs: Operation chargesList
  
  List charges
  
  @param string $state The state filter (optional)
  @param int $skip Number of items to skip when paging (optional, default to 0)
  @param int $limit Number of items to retrieve when paging (optional, default to 100)
  @param string $expand Allows expanding related entities in the response. Only valid entry is &#39;customer&#39; (optional)
  @throws \zipMoney\ApiException on non-2xx response
  @return \zipMoney\Model\ChargeCollection