text: import json
  import os
  import requests
  import sys
  
  
  # Official One
  url = 'https://api.mjml.io/v1/render'
  username = os.getenv('MJML_USERNAME')
  password = os.getenv('MJML_PASSWORD')
  
  # Free One
  if username is None or password is None:
      url = 'https://mjml.dev'
  
  print("Rendering with:", url)
  
  input_filename = sys.argv[1]
  output_filename = sys.argv[2]
  
  with open(input_filename, 'r') as file_open:
      payload = {'mjml': file_open.read()}
  
  r = requests.post(url, json=payload, auth=(username, password))
  
  with open(output_filename, 'w') as file_open:
      file_open.write(r.json()['html'])
  