curl --request POST \
  --url https://sandbox-openplatform.keysecure.io/open-api/v1/cardholder/apply \
  --header 'Content-Type: application/json' \
  --header 'Api-Key: your_api_key' \
  --header 'Timestamp: 1716307200000' \
  --header 'Access-Token: your_access_token' \
  --data '{
    "cardholder_no": "",
    "cardholder_unique_no": "MERCHANT_USER_001",
    "sumsub_share_token": "your_sumsub_share_token"
  }'

{
  "code": 0,
  "msg": "Success",
  "data": {
    "cardholder_no": "",
    "cardholder_unique_no": ""
  }
}