code: function buildGiBidRequest(bidRequest) {
    let giBidRequest = {
      bid_id: bidRequest.bidId,
      pid: bidRequest.params.pid, // required
      tid: bidRequest.params.tid, // required
      known: bidRequest.params.known || 1,
      is_video: bidRequest.mediaType === 'video',
      resp_type: 'JSON',
      provider: 'direct.prebidjs'
    };
    if (bidRequest.sizes) {
      giBidRequest.size = produceSize(bidRequest.sizes);
    }
    addVideo(bidRequest.params.video, giBidRequest);
    addOptional(bidRequest.params, giBidRequest, OPTIONAL_PROPERTIES);
    return giBidRequest;
  }
docs: Builds GI bid request from BidRequest.
  
  @param {BidRequest} bidRequest.
  @return {object} GI bid request.