One of the most common errors you might encounter implementing Google Play Billing is BillingResponseCode.ITEM_UNAVAILABLE (code 4). The corresponding message from the BillingClient API is frustratingly vague:
Requested product is not available for purchase
Fortunately, this error is solved easily by checking the following:
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Here's how to test Google Play Billing's DEFERRED Proration Mode Google Play Billing.
Google Play Billing Library v5, subscription offers, LiveOps events, prepaid subscriptions & everything you need to know about IAPs and from Google I/O.
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