There are cases where a result response is not received from iOS after completing the purchase.

[baesumin]

There is no problem on Android, but on iOS, the currentPurchase value may not come in from the useIAP hook after completing the purchase.

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ex)
const {
getProducts,
currentPurchase,
currentPurchaseError,
finishTransaction,
requestPurchase,
} = useIAP();

useEffect(() => {
if (currentPurchase) {
console.log(currentPurchase); // -> Sometimes it doesn't work on iOS
}
}, [currentPurchase]);

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Is there anything I'm missing?

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Additionally, I found a situation where receipt details were not sent to the callback if user used another payment method instead of paying with a credit card.