Oh my Lordy, the process is SO Japanese (= incompetent and broken).
A few weeks ago I bought a Z5ii, which earned me a ¥15,000 Nikon rebate. But it was only applicable when buying from specified shops. Had to access a web page and download a six page PDF explaining what to do. It contradicted itself in several ways, but in the end I posted off a letter with three physical bits and bobs. Last week I got a mystery postcard in my mail box, from Nikon. Said to watch out for more info … Today I was looking at random emails received over the last couple of days, and was surprised to see one from Nikon. Clicked a link and was faced with three different obscure sets of data, and a notice that if I don’t do all this by the 19th of Feb I will get nothing. Proceeded to do a very anal set of chess moves, and now have a QI code to use at a local convenience store, which I must use at a special machine and then hopefully get the money in cash.
EVERYTHING digital and online like this is totally messed up in Japan. Everything! Even a Nikon rebate becomes a game of 3D chess

I am sure Akira will agree :-)