Check if the subscription has expired or not

[MC-HaoPhan]

Hi, I'm looking to check if someone's subscription has expired or not.
I used the function

RNIap.getPurchaseHistory().then((res: (InAppPurchase | SubscriptionPurchase)[]) => {
const purchase = res[res.length - 1]
if (purchase) {
validateReceipt(purchase)
}
})

Then I used validateReceiptIos function and it worked perfectly. But the validateReceiptAndroid function is for debugging only. My application is using firebase and has no backend, can anyone guide me how to deal with Android? Thank you people.