トークンの生成

POST /api/v1/tokenization/generate

{
  "tokenRequestId": "treq_a1b2c3d4e5f6",
  "merchantUserId": "user_123",
  "tokenType": "CARD",
  "merchantInfo": { "merchantId": "M000001" },
  "notifyUrl": "https://your-site.com/webhook/tokenization"
}

{
  "code": "0",
  "msg": "Success",
  "data": {
    "tokenSessionId": "tsess_xxxxxxxxxxxx"
  }
}