An NZETA is an official document that allows you to travel to and travel within a country. The NZeTA is an electronic alternative to the regular visa and is issued by the government of the country in question. You can apply for an NZETA completely digitally, so you do not have to go to the embassy for this. After granted, you will receive your NZETA by email "visa@new-zealandeta.org" For Cuba, you will receive your NZETA by post. For China, you will receive both by post and email documents.
NZeTA Visa Information