Toss Payment API confirm always response error result

After i make payment successfully, i was redirected to successful url attached in request. Then i call confirm api it always returned response error:
1. The 400 status code error
{
"code": "ALREADY_PROCESSED_PAYMENT",
"message": "."
}
2. The 500
{
"code": "FAILED_PAYMENT_INTERNAL_SYSTEM_PROCESSING",
"message": "[S021] . ."
}
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