curl --request POST \
  --url https://app.yampi.ai/api/v1/accounts/{account_id}/opportunities/{opportunity_id}/documents \
  --header 'Content-Type: multipart/form-data' \
  --header 'api_access_token: <api-key>' \
  --form file=@example-file

const form = new FormData();
form.append('file', '<string>');

const options = {method: 'POST', headers: {api_access_token: '<api-key>'}};

options.body = form;

fetch('https://app.yampi.ai/api/v1/accounts/{account_id}/opportunities/{opportunity_id}/documents', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://app.yampi.ai/api/v1/accounts/{account_id}/opportunities/{opportunity_id}/documents"

files = { "file": ("example-file", open("example-file", "rb")) }
headers = {"api_access_token": "<api-key>"}

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

print(response.text)

{}

{
  "description": "<string>",
  "errors": [
    {
      "field": "<string>",
      "message": "<string>",
      "code": "<string>"
    }
  ]
}

{}

{
  "error": "<string>"
}