The complete walkthrough of using receipt validation is here: https://playfab.com/show-me-money-receipt-validation-ios-and-android/ (we'll be adding Amazon to this, and moving it to the tutorials section of our site soon), while the walkthrough of using non-receipt payment options is here: https://api.playfab.com/docs/non-receipt-purchasing. We also provide a sample title built in Unity showing integration with many PlayFab features (including receipt validation) here: https://github.com/PlayFab/UnicornBattle
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