Extend user proxy expiration

PATCH https://example.com/proxy_api/v1/tl-isps/users/extend/{user_id}

To extend a single sub-user, you need to provide the following information:

Input user_id as a parameter. this extends the expiration date of the proxies associated with the given sub-user account by exactly 30 days for all products.

Optionally, you can specify the payment terms for the proxies using the payTerms query parameter. 
The payTerms parameter allows you to control the extend period of the proxies.

Choose from the following options:
  - "monthly": Proxies will be extended by one month.
  - "quarterly": Proxies will be extended by three months.
  - "semi-annually": Proxies will be extended by six months.
  - "annually": Proxies will be extended by one year.

  Returns information about an extended single sub-user.