curl --request POST \
  --url https://api.paytsoftware.com/v1/files \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "administration_id": "<string>",
  "files": [
    {
      "byte_size": 123,
      "checksum": "<string>",
      "content_type": "<string>"
    }
  ]
}
'

{
  "checksum": "<string>",
  "url": "<string>",
  "expires_at": "2023-11-07T05:31:56Z"
}