Japan requires recognized IDs for proof of purchase. As a foreigner, you don’t have Japan issued IDs, so your only proof is a passport, because it’s an internationally recognized document. Japanese people don’t know what every other countries IDs look like or any way to verify that they’re real, but they do understand that passports are official.
If you had a JP ID, you could use something much less in terms of ranking, like an insurance card.
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