An example script that uses the POST HTTP method to send payloads in asynchronous way.

async_post_request_example.py

import asyncio
import json

import aiohttp
from aiohttp import ClientConnectorError, ClientSession

payload_contact = {
    "email": "example0@mail.pl",
    "hubspot_id": 11111,
    "first_name": "test",
    "last_name": "test",
    "phone_mobile": 333445555,
}

host = "https://...."
url = f"{host}/api/v1/...."


async def fetch_html(url: str, session: ClientSession, data):
    credentials = {
        "username": "test",
        "password": "test",
        "api_key": "test",
    }
    try:
        headers = {
            "accept": "application/json",
            "Content-Type": "application/json",
            "apikey": credentials["api_key"],
        }
        auth = aiohttp.BasicAuth(credentials["username"], credentials["password"])
        resp = await session.request(
            method="POST",
            url=url,
            json=data,
            headers=headers,
            auth=auth,
            verify_ssl=False,
        )
    except Exception as e:
        return str(e)
    return [url, resp.status, await resp.text()]


async def make_requests(url, payload_list, **kwargs):
    async with ClientSession() as session:
        tasks = []
        for payload in payload_list:
            tasks.append(fetch_html(url=url, session=session, data=payload))
        results = await asyncio.gather(*tasks)

    for result in results:
        print(result)


if __name__ == "__main__":
    # Genereate testing payloads
    payload_list = [payload_contact for x in range(20)]
    asyncio.run(make_requests(url=url, payload_list=payload_list))

@winiar93, thank you for sharing!