FAILED_INTERNAL_SYSTEM_PROCESSING mertKey가 없다고 나옵니다.

: LIVE, 만 Mertkey.
mId: bill_gplayojcx ?

POST 시 response
https://api.tosspayments.com/v1/billing/authorizations/card
{
"code": "FAILED_INTERNAL_SYSTEM_PROCESSING",
"message": "[XC11] Cannot invoke "String.getBytes()" because "mertKey" is null"
}


https://docs.tosspayments.com/guides/v2/billing/integration-api
API.
자동결제(빌링) API로 연동하기 | 토스페이먼츠 개...
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