curl --request POST \
  --url https://api.example.com/v1/crm/requests/{request_id}/period/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "time_period": 123,
  "inventory_ids": [
    123
  ],
  "sets": [
    {
      "set_id": 123,
      "inventory_ids": [
        123
      ]
    }
  ]
}
'

{
  "inventory_ids": [
    123
  ],
  "sets": [
    {
      "set_id": 123,
      "inventory_ids": [
        123
      ]
    }
  ]
}