Unity IAP, Multi-quantity: Billing library version 4.0+ is required to use this feature
I am trying to setup Unity IAP for google play store, whenever I create an in-app product,
the multi-quantity check mark is disabled,
“Billing library version 4.0+ is required to use this feature”
Using unity IAP 4.22.2
unity 2022.3.18f
target SDK tried both 31 and 34
The item you were attempting to purchase could not be found
The payment works fine in the Google Play Console internal test. However, when I uploaded the app to production to release it, I received the review and the app was rejected and suspended because of that error. So I put in an inquiry and was told to fix the in-app payment error and get it reviewed again. What should I do?