Hon CHRIS HIPKINS: There's two things the member may be referring to. One is the health certificate, which is used domestically. The other is international travel documentation used for the purposes of leaving and entering New Zealand. One of the reasons that things around the international space are less certain is that an international standard for that has not yet been reached. It is important that whatever system we adopt here in New Zealand is interoperable with systems being adopted by other countries. We are working closely with Australia and the EU in particular around making sure that the system that we're putting in place is interoperable with their system, because it is in all of our best interests for there to be a good degree of transferability around health passes, vaccination, and testing results for the purposes of international travel.