IAP Manager : error when the user doesnt have any credit card registered on his phone

Maybe you can prompt the user to check the settings after receiving this error message.

 

Understand what you are saying. To make a purchase on Google Play, Unity IAP uses Google Play Billing. When Unity IAP gets a "Purchasing Unavailable" response from Google Play Billing, we can only pass it to the developer, which requires the developer to handle it.
https://developer.android.com/reference/com/android/billingclient/api/BillingClient.BillingResponse

 

Hi Julien. I think maybe the game logic should be modified. Even if IAP is not successfully initialized, it should not affect the user to launch the game. What do you think?

In addition, when the IAP initialization fails, the Initialization Failure Reason will be returned in IStoreListener.OnInitializeFailed. You can remind the user to check the settings here.

Code (CSharp):

1.  public void OnInitializeFailed(InitializationFailureReason error)
2.     {
3.         //Debug.Log("****************OnInitializeFailed, error:" + error);
4.         switch (error)
5.         {
6.             case InitializationFailureReason.AppNotKnown:
7.                 break;
8.             case InitializationFailureReason.NoProductsAvailable:
9.                 break;
10.             case InitializationFailureReason.PurchasingUnavailable:
11.                 break;
12.             default:
13.                 break;
14.         }
15.     }