How to check purchase history and order numbers for Google Play and the App Store is as follows.

■ Order Number Format by Store
- Google Play Store: Transaction ID (Format: GPA.0000-0000-0000-00000)
- App Store: Order ID (Mixed letters and numbers starting with 'M')

■ Google Play Store (Android)
- Access the Google Payments Center: pay.google.com
- Log in with the Google account used for purchase > [Activity] > Click the specific item to find the 'Transaction ID'.

■ App Store (iOS) [Web Site]
- Visit the Apple Report a Problem site and log in.
- Select the item from the purchase list to find the 'Order ID'. ※ Please attach a screenshot of this screen for payment-related inquiries.

[Mobile Device]
- Go to [Settings] > Tap [Apple ID (Your Name)] at the top > [Media & Purchases] > [View Account] > [Purchase History]
- Tap the specific purchase to find the 'Order ID'.

※ Please capture the screen and attach the file when making a payment inquiry.