You are required to register to the Yu ID.
There may be some additional requirements depending on how you earn the points.
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Earning by using the post office counter service
A smartphone is required. -
Earning by going to the point office
A smartphone with the Japan Post Official App installed is required.
<To install Japan Post Official App (JPN ver only) >
https://www.lp.jpapp.pf.japanpost.jp/