curl --request POST \
  --url https://api.paytsoftware.com/v1/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "administration_id": "<string>",
  "message": {
    "body": "<string>",
    "subject": "<string>",
    "email": "<string>",
    "cc_email": "<string>",
    "bcc_email": "<string>",
    "attachments": [
      "<string>"
    ]
  },
  "debtor_number": "<string>",
  "debtor_identifier": "<string>",
  "invoice_number": "<string>",
  "invoice_identifier": "<string>",
  "credit_case_number": "<string>"
}
'

{
  "sender_type": "<string>",
  "subject": "<string>",
  "read_by_user": {
    "id": "<string>",
    "name": "<string>",
    "email_address": "<string>"
  },
  "administration_id": "<string>",
  "credit_case_id": "<string>",
  "debtor_id": "<string>",
  "id": "<string>",
  "invoice_id": "<string>",
  "sent_at": "2023-11-07T05:31:56Z",
  "received_at": "2023-11-07T05:31:56Z",
  "read_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "content": "<string>"
}