Hello,At this time, this support forum is focused on the DoubleClick Ad Exchange Buyer REST API. We don't support the AdX real-time bidding protocol. For those sorts of questions, you should reach out to your Technical Account Manager (TAM) or adx-buysi...@google.com if you don't have one.That said, I do happen to know that changes to the protocol should be listed on the real-time bidding developer documentation's release notes. Please reach out to your TAM if you need additional assistance on this topic.Regards,Mark