curl --request POST \
  --url 'https://api.stateset.com/api/v1/gl/periods/{id}/close' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "closed_by": null
}'

{
  "closed_at": null,
  "closed_by": null,
  "created_at": "string",
  "end_date": "string",
  "fiscal_year": 1,
  "id": "string",
  "locked_at": null,
  "locked_by": null,
  "period_name": "string",
  "period_number": 1,
  "start_date": "string",
  "status": "string"
}