curl --request POST \
  --url https://sandbox-openplatform.keysecure.io/open-api/v1/card/pin/set \
  --header 'Content-Type: application/json' \
  --header 'Api-Key: your_api_key' \
  --header 'Timestamp: 1716307200000' \
  --header 'Access-Token: your_access_token' \
  --data '{
    "card_no": "C202605220001",
    "cardholder_no": "U202605220001",
    "pin": "Base64EncodedEncryptedPin..."
  }'

{
  "code": 0,
  "msg": "Success",
  "data": {"result": true}
}