import pandadoc_client
from pandadoc_client.api import documents_api
from pandadoc_client.model.document_send_request import DocumentSendRequest

API_KEY = ""
DOCUMENT_ID = ""

cfg = pandadoc_client.Configuration(
    api_key={"apiKey": f"API-Key {API_KEY}"}"},
)
client = pandadoc_client.ApiClient(cfg)
documents_instance = documents_api.DocumentsApi(client)

document_send_request = DocumentSendRequest(silent=False, subject="This doc was sent via python SDK")
documents_instance.send_document(DOCUMENT_ID, document_send_request=document_send_request)

pandadoc_client.exceptions.ApiTypeError: Invalid type for variable 'expiration_date'. Required value type is str and passed type was NoneType at ['received_data']['expiration_date']

import requests

API_KEY = ""
DOCUMENT_ID = ""    # same template as the previous example

headers = {
    "Content-Type": "application/json",
    "Authorization": f"API-Key {API_KEY}"
}

url = "https://api.pandadoc.com/" + f"public/v1/documents/{DOCUMENT_ID}/send"
res = requests.get(url, headers=headers)
document_sent_response_dict = res.json()

{
    "message": "An unexpected error occurred.",
    "errors": "Invalid type for variable 'expiration_date'. Required value type is str and passed type was NoneType at ['received_data']['expiration_date']"
}