On Android: A transaction number looks like this: GPA.1234-1234-1234-12345. You can find it in the
receipt you received from Google via email after completing your purchase in the game.

On Huawei: If you are playing on Huawei devices, please send a screenshot of the payment from the purchase history of AppGallery.

On iOS: For iOS, please send a screenshot of Apple's Receipt letter that came to your mail after completing your purchase in the game.