react-native-iap: FinishTransaction() & FinishTransactionIOS() returns undefined, and these 2 functions + clearTransactionIOS() does not clear pendingTransaction array from getPendingPurchasesIOS(), PLEASE HELP!!

Version of react-native-iap

“react-native-iap”: “^5.0.1”

Version of react-native

react-native-cli: 2.0.1 react-native: 0.62.2

Platforms you faced the error (IOS or Android or both?)

IOS (SandBox Testing)

Expected behavior

I’m assuming: Calling FinishTransaction()\FinishTransactionIOS() returns some sort of ackResult confirm that the purchase has finished, but since the return type for these 2 functions is Promise(void), so I am not sure if it is supposed to be undefined, is undefined the expected behavior?

Actual behavior

FinishTransaction() & FinishTransactionIOS() returns undefined after I finish doing server-side validation (Tested and working), and when I call getPendingPurchasesIOS() after, it logs that the purchase is still inside the array, the same case happens when I do clearTransactionIOS(), it appears that the purchase is still inside the array.

Tested environment (Emulator? Real Device?)

Real Device

Steps to reproduce the behavior

Make a purchase, and it logs after the purchase has been successful

I have read https://github.com/dooboolab/react-native-iap/issues/933, https://github.com/dooboolab/react-native-iap/issues/1019 and other posts that might be related, and I was not able to find a solution

So to summarize:

1. (Need Clarification + possible issue)Are FinishTransaction() & FinishTransactionIOS() supposed to return undefined? If not what is the expected result upon successful purchase and failing receipt, and not sure why I am getting undefined.

2. (Need Clarification)Are FinishTransaction() & FinishTransactionIOS() supposed to remove purchase off pendingTransactionList upon succuess?

3.(Possible Issue) FinishTransaction() & FinishTransactionIOS() & clearTransactionIOS() does not clear pending Transaction, calling getPendingPurchasesIOS() still returns the current purchase inside array.

Below is the snippet of my code, and I have called interconnection elsewhere, and the connection is working, and when I initially call getPendingPurchasesIOS() right after the connection has been established it returns an empty array meaning no purchase has been made, which is expected!

 useEffect(() => {
    getSubscriptions()
    purchaseUpdateSubscription = purchaseUpdatedListener(
      async (purchase) => {
        console.log('The Update was captured! ', purchase)
        const receipt = purchase.transactionReceipt
        if (receipt) {
          try {
            if (Platform.OS === 'ios') {
            const body = {
              "receipt": purchase
            }

            const verify = await iap.post('xxxxx', body) \\ server side validation works! Returns proper response
            console.log('Here comes the verify: ', verify) \\ returns response from server side
            const pendingPurchase = await RNIap.getPendingPurchasesIOS()
            console.log('PendingPurchase1 : ', pendingPurchase) \\ not empty

            const ackResult = await finishTransaction(purchase, false)
            console.log('Ack Result: ', ackResult) \\ undefined 
            const pendingPurchase2 = await RNIap.getPendingPurchasesIOS()
            console.log('PendingPurchase2 : ', pendingPurchase2) \\ not empty

            const iosackResult = await RNIap.finishTransactionIOS(purchase.transactionId)
            console.log ('iosackResult: ', iosackResult) \\ undefined
            const pendingPurchase3 = await RNIap.getPendingPurchasesIOS()
            console.log('PendingPurchase3 : ', pendingPurchase3) \\ not empty

            clearTransactionIOS()
            const pendingPurchase4 = await RNIap.getPendingPurchasesIOS()
            console.log('PendingPurchase4: ', pendingPurchase4) \\ not empty

        }
          } catch(ackErr) {
            console.warn('ackErr', ackErr)
          }
        }
      }
    )

I have been pulling my hair out on this… Any help and advice will be greatly appreciated. @hyochan