Payment completed with error

[Hitesh548]

Version of flutter_inapp_purchase - 5.4.2

Platforms you faced the error - IOS

Tested environment - Real Device

<SKPaymentQueue: 0x303de0820>: Payment completed with error: Error Domain=ASDErrorDomain Code=500 "(null)" UserInfo={NSUnderlyingError=0x30309a940 {Error Domain=AMSErrorDomain Code=301 "Invalid Status Code" UserInfo={NSLocalizedDescription=Invalid Status Code, AMSURL=https://sandbox.itunes.apple.com/WebObjects/MZBuy.woa/wa/inAppBuy?REDACTED, AMSStatusCode=500, NSLocalizedFailureReason=The response has an invalid status code}}, storefront-country-code=USA, client-environment-type=Sandbox}

Purchase Failed !!
flutter: purchase-error: responseCode: null, debugMessage: SKPaymentTransactionStateFailed, code: E_UNKNOWN, message: An unknown or unexpected error has occured. Please try again later.

Getting this above error when we upgrade the auto-renewable plan from monthly to yearly

[giantss]

I also got the same error: responseCode: null, debugMessage: SKPaymentTransactionStateFailed, code: E_UNKNOWN, message: An unknown or unexpected error has occurred. Please try again later.

But my logic is that (sandbox environment) subscribe first, then unsubscribe, and then subscribe again (FlutterInappPurchase.purchaseError.listen is called back after entering the sandbox account password), and this error occurs.

This logic will definitely cause this error. Is this a bug?
@hyochan