curl --request POST \
  --url https://api.example.com/v1/invoices/upload \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form primary='@example-file' \
  --form attachments.items='@example-file'

const form = new FormData();
form.append('primary', '<string>');
form.append('attachments.items', '{
  "fileName": "example-file"
}');

const options = {method: 'POST', headers: {Authorization: 'Bearer <token>'}};

options.body = form;

fetch('https://api.example.com/v1/invoices/upload', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.example.com/v1/invoices/upload"

files = {
    "primary": ("example-file", open("example-file", "rb")),
    "attachments.items": ("example-file", open("example-file", "rb"))
}
headers = {"Authorization": "Bearer <token>"}

response = requests.post(url, files=files, headers=headers)

print(response.text)

{
  "invoice_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "status": "queued",
  "documents": {
    "primary": {
      "document_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "file_name": "<string>"
    },
    "attachments": [
      {
        "document_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "file_name": "<string>"
      }
    ]
  },
  "created_at": "2023-11-07T05:31:56Z"
}

{
  "error": {
    "code": "invalid_request",
    "message": "<string>",
    "request_id": "<string>",
    "description": "<string>"
  }
}

{
  "error": {
    "code": "invalid_token",
    "message": "<string>",
    "request_id": "<string>",
    "description": "<string>"
  }
}

{
  "error": {
    "code": "token_disabled",
    "message": "<string>",
    "request_id": "<string>",
    "description": "<string>"
  }
}

{
  "error": {
    "code": "duplicate_invoice",
    "message": "<string>",
    "request_id": "<string>",
    "existing_invoice_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "description": "<string>"
  }
}

{
  "error": {
    "code": "length_required",
    "message": "<string>",
    "request_id": "<string>",
    "description": "<string>"
  }
}

{
  "error": {
    "code": "payload_too_large",
    "message": "<string>",
    "request_id": "<string>",
    "description": "<string>"
  }
}

{
  "error": {
    "code": "unsupported_media_type",
    "message": "<string>",
    "request_id": "<string>",
    "description": "<string>"
  }
}

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "<string>",
    "request_id": "<string>",
    "description": "<string>"
  }
}

{
  "error": {
    "code": "internal_error",
    "message": "<string>",
    "request_id": "<string>",
    "description": "<string>"
  }
}

{
  "error": {
    "code": "service_unavailable",
    "message": "<string>",
    "request_id": "<string>",
    "description": "<string>"
  }
}