Same here with Xcode 12.2 and iOS 14.2
2020-12-03 12:25:08.885572+0530 Application[1496:171076] <SKPaymentQueue: 0x282ef5c40>: Payment completed with error: Error Domain=ASDErrorDomain Code=500 "Unhandled exception" UserInfo={NSUnderlyingError=0x282248150 {Error Domain=AMSErrorDomain Code=100 "Authentication Failed" UserInfo={NSLocalizedFailureReason=The verify credentials call failed., NSLocalizedDescription=Authentication Failed, NSUnderlyingError=0x282248330 {Error Domain=AMSErrorDomain Code=301 "Invalid Status Code" UserInfo={NSLocalizedDescription=Invalid Status Code, NSLocalizedFailureReason=The response has an invalid status code}}}}, NSLocalizedFailureReason=An unknown error occurred, NSLocalizedDescription=Unhandled exception}
2020-12-03 12:25:08.890414+0530 Sleep Solutions[1496:169933] (
"<SKPaymentTransaction: 0x282edc890>"
)