iOS In-App Purchasing: purchase() returns error 31

[GForceProductions]

Summary: In Godot 3.2.3 with built-in iOS IAP singleton everything worked. In Godot 3.3.2 using the plug-in, calling purchase() returns error with code 31. Using the exact same project.

Steps to reproduce:

• Download the release plugins3.3.zip
• Copy the inappstore folder from the zip
• Paste it inside Projectfolder/ios/plugins
• Export the project with the In App Store plugin ticked
• On an xcode simulator or a real iphone, press a button that calls the purchase() method
• It will return with an error: 31

[naithar]

31 error is ERR_INVALID_PARAMETER. This means that purchase method hadn't found a purchase with ID you have used. Code responsible for it: https://github.com/godotengine/godot-ios-plugins/blob/master/plugins/inappstore/in_app_store.mm#L104-L130

Godot 3.2.3 and previous InAppStore modules was using deprecated api: https://github.com/godotengine/godot/blob/3.2/platform/iphone/in_app_store.mm#L265-L282 This was fixed in plugin. Right now you are required to make a request_product_info with SKU values before making any purchase. This method should have been called in previous versions too, but it wasn't required due to the way module worked and because of deprecated api.

Plugin's Readme file have an example of how it should be used: https://github.com/godotengine/godot-ios-plugins/blob/master/plugins/inappstore/README.md

[GForceProductions]

Hi Naithar, thanks for the tip. Now I added the request_product_info part. However, in XCode it says the following:

From the first three lines, it seems gold and silver have been added. (gold and silver are the product_id's registered in appstoreconnect, which I also used before for purchasing)

The lines below those are what I print myself in Godot. Inside check_events(), I do receive an event of type "product_info", but the result is "error". Any idea what could be the problem?

EDIT: so for completeness, calling purchase still results in error 31

[naithar]

request_product_info produces product_info event and error value should contain localized description taken from native error: https://github.com/godotengine/godot-ios-plugins/blob/master/plugins/inappstore/in_app_store.mm#L137-L146. Are you testing on simulator? Are you using sandbox account or StoreKit configuration file to test an app? Does this issue happen on application uploaded to TestFlight?

EDIT: so for completeness, calling purchase still results in error 31

request_product_info have failed, so purchase will still be unable to find a product by it's ID.

[GForceProductions]

It looks like it does work in the real app through Testflight. Previously, it also worked directly in XCode, so this apparently also changed with the fix. Thank you for all the help!