✔ 最佳答案
According to Japanese law, you need a professional guide license before you get paid by guiding foreign visitors with foreign language.
"Professional guide" above is formally called "通訳案内士."
However, the guide examination license is issued for guiding with English, French, Spanish, German, Mandarin, Italian, Portuguese, Russian, Korean and Thai --- but no Malay or Indonesian.
It is generally believed that the guide license exam is pretty challenging since the exam requires knowledge about Japanese geography, culture, history, industry, politics, and economics as well as foreign language.
I wish my answer helps.