curl --request POST \
  --url 'https://api.sandbox.stateset.app/api/v1/sandbox/{sandboxId}/extend' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "additional_seconds": 1
}'

{
  "sandbox_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "status": "creating",
  "expires_at": "2026-07-24T12:00:00Z",
  "max_expires_at": "2026-07-24T12:00:00Z",
  "max_lifetime_seconds": 1,
  "remaining_extend_seconds": 1,
  "requested_additional_seconds": 1,
  "applied_additional_seconds": 1
}