code: function(bidRequests, bidderRequests) {
      let payload = generatePayload(bidRequests, bidderRequests);
      return {
        method: 'POST',
        url: BID_URL,
        data: JSON.stringify(payload)
      };
    }
docs: Make a server request from the list of BidRequests.
  
  @param {BidRequest[]} bidRequests A non-empty list of bid requests which should be sent to the Server.
  @param {BidderRequests} bidderRequests
  @return ServerRequest Info describing the request to the server.