Google Play Billing returns OK but purchase dialog says item not found for a previously purchased product
I am troubleshooting a previously working consumable purchase in a Flutter Android app using in_app_purchase_android.
The same product, idol_points_1000, was successfully purchased three times. Current purchase attempts display a Google Play error dialog saying that the requested item could not be found.
Current behavior:
- Product ID: idol_points_1000
- Product type: inapp
- Product lookup returns the requested product with responseCode=0.
- launchBillingFlow returns responseCode=0.
- Google Play then displays the item-not-found error.
- No purchase_callback entry appears in the logs I collected.
My additional diagnostic logs show:
```text
productId=idol_points_1000
productType=inapp
cachedProduct=true
offerPresent=true
queryAgeMs=110675
oneTimeDisplayedOffer=true
tokenFromLatestCache=true
launch_result responseCode=0
```
The native purchase code uses cached ProductDetails and the offer token from the displayed one-time purchase offer.
Test device: Samsung Galaxy S24 (SM-S921N).
Installed app: version 0.2.1, versionCode 34.
I understand that launchBillingFlow returning OK only confirms that the launch request was accepted, not that the purchase succeeded.
How can I diagnose the failure that occurs inside the Google Play purchase UI after this successful launch response? Which values should I compare with the previously successful purchases, and how can I capture the final Billing error when my purchase callback log is missing?
