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Well, I bought a ¥5,000 Amazon Japan Gift Card. I received an email saying that they are currently processing my order. They'll send a confirmation once my balance has been updated (typically within 5 minutes of placing the order).

I was withdrawn of 0,001€ so far lol I'll have to wait hoping it worked.

-----UPDATE------
After 35 minutes, I'm still waiting for my 5000yen... Here's what is written under my ¥ 5,000 Gift Card purchase history:
ステータス ---> 処理中

Usually, it takes only 5 minutes, but as it takes longer, I'm worried about my money...