Hello, I am working on implementing the In-App Purchases (IAP v2.0).
When starting a purchase request from my app, I want to pass a specified string into the In-App Purchases API. And the specified string is used to specify any additional arguments that I want Amazon to send back along with the purchase response.
Other platforms provide a developer-specified string (developerPayload in Google Play). Is there something like this on Amazon IAP?