curl --request POST \
  --url https://api.raul.ugps.io/api/v1/subscription_details/assign-to-child \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "parent_client_id": "<string>",
  "child_client_id": "<string>",
  "subscription_ids": [
    "<string>"
  ]
}
'

{
  "success": true,
  "message": "<string>",
  "count": 123,
  "child_client_id": "<string>"
}