Your purchase receipt will be delivered to your email address after you complete the transaction. If you are unable to locate the receipt in your mailbox, please follow the steps below to download the receipt from Apple, Google Play, Amazon, Windows and Huawei:

AppStore:
1. Open Settings on your device
2. Tap your name, then tap Media & Purchases. You may be asked to sign in.
3. Tap Purchase History and select the order to get the receipt.
For further assistance, please contact Apple Support.

Google Play:
1. Open the Play Store (You must be signed in)
2. At the top right, tap your profile icon
3. Tap Payments and subscriptions
4. Tap Payment method > More options > More Payment Settings
5. You will be redirected to Google Payments Center Page
6. Tap on Menu (Top left hand side) > Activity 
7. Select the order to get the receipt
For further assistance, please contact Google Support or visit your Google Wallet.

Amazon AppStore:
All purchase receipts for Amazon AppStore will be delivered to your email address. For more information, please contact Amazon Support.

Microsoft Store:
1. Open the Microsoft Store
2. At the top right, tap your profile icon. You might be asked to sign in.
3. You will be redirected to your Microsoft account
4. Scroll down to check your order history
For further assistance, please contact Microsoft Support.
 
Huawei AppGallery:
1. Go to Settings > Account center 
2. Tap on Payment and urchases and go to Purchase history
3. Tap the related order, then tap REQUEST INVOICE. Fill in all required fields.
Note: You can only request an invoice 48 hours after the payment is made.
For further assistance, please contact Huawei Support.