curl --request POST \
  --url https://core-dev.quidkey.com/api/v1/oauth2/refresh \
  --header 'Content-Type: application/json' \
  --data '
{
  "refresh_token": "refresh_token_abc123"
}
'

{
  "success": true,
  "data": {
    "access_token": "example_access_token_xyz789",
    "refresh_token": "example_refresh_token_abc123",
    "token_type": "Bearer",
    "expires_in": 3600
  }
}