Well tested and implemented software via official whtsapp API

python.whatsapp.facebook.py

import requests
import json

url = "https://graph.facebook.com/v13.0/101878115921874/messages"

payload = json.dumps({
  "messaging_product": "whatsapp",
  "to": "918733067278",
  "type": "template",
  "template": {
    "name": "hello_world",
    "language": {
      "code": "en_US"
    }
  }
})
headers = {
  'Content-Type': 'application/json',
  'Authorization': 'Bearer EAAIcDJEZC4KMBAGRZAz9rokLqP3sRHgC24BuyWVi8ZBwLVt1jnC4cZCbkJQudMzNCE9iYL2fmjGGxG9BIcJwrhXdbYDaCb2gGIfZCZBiVfKLtkX4fChTayg9C9ZCgq07RLgoBC0kahdOQ9M0WOYaj6U5xQZA2tdttjLUgWZBH43pkRJSP3kH6AkvtQ22PKYpEGfOTQ8XZASer0ZAwZDZD'
}

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)