デベロッパの回答 、 The app is 1000 yen ($5.99 USD). Apple groups multiple transactions made within a 3-4 day period across the App Store and iTunes into a single transaction to reduce their bank transaction fees. For example, if an app purchase was made within a few days of a movie rental, streaming subscription renewal, or Apple Music renewal, those charges would all be combined with the app purchase into a single transaction, so you're seeing several of your purchases grouped together with this 1000 yen app purchase. Your email receipt will show the itemized amounts so you can how much you paid for each item in the transaction. Please check the email account associated with your Apple ID and search for emails with the subject, "Your receipt from Apple". You will find that your purchase of BrainWave was combined with other charges into a single transaction.
I have dedicated the last 17 years to developing these apps and supporting its customers, I assure they are not a scam. It is also impossible for any app developer to directly charge a user's account because they have no access to your account or identity, and no access to your credit card. For privacy and security Apple does not allow app developers or publishers any access or visibility into App Store transactions or user accounts. Apple handles 100% of the transaction and the developer never has access to payment methods or even the name of the customer, so there is no way a developer could ever charge your credit card.
If you have any questions please use the "Email Support" button in the app and I'll be happy to help further.
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