You can check your Apple App Store order number on the payment receipt sent to your Apple Account mailbox

or directly through iTunes.

■ How to Check Your App Store Payment History on Your IOS Mobile Device ①

Launch App Store → Tap Today Profile → Tap your Apple ID and enter your password → Purchase History

→ Tap Change filter → Tap Set Filter → Tap Apply with Date Range "Last 90 days," Cost "Paid," and Type "In-app Purchase"

→ Tap Apply → Tap "Total" in Purchase history to view order history

■ How to Check Your App Store Payment History on Your IOS Mobile Device ②

Tap Settings → Top Apple ID, iCloud, Media & Purchases → Media & Purchases → View Account

→ Purchase History → Change Filter → Set Filter → Date Range "Last 90 Days", Cost "Paid", and Type "In-app Purchases"

→ Tap Apply → Tap "Total" in Purchase history to view order history

■ How to Check Your Order Number in iTunes

 1. Open the iTunes app.

 2. Log in with your Apple account.

 3. Tap Account at the top of the screen and select View Account.

 4. Enter your password and tap View Account.

 5. At the bottom of the screen, tap View All to the right of the Most Recent Purchase in Purchase History.

 6. Tap the arrow to the left of the order date and click "View Order Number" in the upper right corner.