code: public function listMarketplaceParticipationsByNextToken($request)
      {
          if (!($request instanceof MarketplaceWebServiceSellers_Model_ListMarketplaceParticipationsByNextTokenRequest)) {
              $request = new MarketplaceWebServiceSellers_Model_ListMarketplaceParticipationsByNextTokenRequest($request);
          }
          $parameters = $request->toQueryParameterArray();
          $parameters['Action'] = 'ListMarketplaceParticipationsByNextToken';
          $httpResponse = $this->_invoke($parameters);
  
          $response = MarketplaceWebServiceSellers_Model_ListMarketplaceParticipationsByNextTokenResponse::fromXML($httpResponse['ResponseBody']);
          $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
          return $response;
      }
docs: List Marketplace Participations By Next Token
  Returns the next page of marketplaces and participations using the NextToken value
  that was returned by your previous request to either ListMarketplaceParticipations or
  ListMarketplaceParticipationsByNextToken.
  
  @param mixed $request array of parameters for MarketplaceWebServiceSellers_Model_ListMarketplaceParticipationsByNextToken request or MarketplaceWebServiceSellers_Model_ListMarketplaceParticipationsByNextToken object itself
  @see MarketplaceWebServiceSellers_Model_ListMarketplaceParticipationsByNextTokenRequest
  @return MarketplaceWebServiceSellers_Model_ListMarketplaceParticipationsByNextTokenResponse
  
  @throws MarketplaceWebServiceSellers_Exception