curl --request POST \
  --url https://api.usenexio.com/api/v1/conversation-instances/{instance_slug}/conversations/{conversation_id}/attachments/reserve \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "end_user": "u_dana_ortiz",
  "filename": "statement-of-values.xlsx",
  "content_type": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
  "size_bytes": 18874368
}
'

import requests

url = "https://api.usenexio.com/api/v1/conversation-instances/{instance_slug}/conversations/{conversation_id}/attachments/reserve"

payload = {
    "end_user": "u_dana_ortiz",
    "filename": "statement-of-values.xlsx",
    "content_type": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "size_bytes": 18874368
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    end_user: 'u_dana_ortiz',
    filename: 'statement-of-values.xlsx',
    content_type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
    size_bytes: 18874368
  })
};

fetch('https://api.usenexio.com/api/v1/conversation-instances/{instance_slug}/conversations/{conversation_id}/attachments/reserve', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "attachment": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "filename": "<string>",
    "media_type": "<string>",
    "size_bytes": 123,
    "status": "storing",
    "delivery": "file",
    "created_at": "2023-11-07T05:31:56Z",
    "notice": "<string>",
    "error": "<string>",
    "container_kind": "zip",
    "parent_attachment_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "expires_at": "2023-11-07T05:31:56Z"
  },
  "upload_url": "<string>",
  "upload_url_expires_at": "2023-11-07T05:31:56Z",
  "source_path": "<string>"
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<unknown>"
}

{
  "code": "unauthorized",
  "message": "Missing or invalid API key"
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<unknown>"
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<unknown>"
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<unknown>"
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<unknown>"
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<unknown>"
}

{
  "code": "rate_limited",
  "message": "Rate limit exceeded"
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<unknown>"
}

{
  "code": "attachments_unavailable",
  "message": "File attachments are not available in this environment."
}

{
  "code": "request_timeout",
  "message": "Request timed out"
}