code: function(validBidRequests, bidderRequest) {
      var data = JSON.stringify(getPayloadFor(validBidRequests, bidderRequest));
      return {
        method: 'POST',
        url: ENDPOINT_URL,
        data,
        bidRequest: validBidRequests,
      };
    }
docs: Make a server request from the list of BidRequests.
  
  @param {validBidRequests[]} - an array of bids
  @param {bidderRequests} - an object containing all bid params, including validBids.
  @return ServerRequest Info describing the request to the server.