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To use the SMS API in Python, you can follow these steps:

1. Install the RingCentral Python SDK by running the following command:

   pip install ringcentral python-dotenv
   

2. Create a file called sms.py and import the necessary modules:

   import os
   from dotenv import load_dotenv
   from ringcentral import SDK
   

3. Load the environment variables from a .env file:

   load_dotenv()
   

4. Instantiate the SDK and get the platform instance:

   rcsdk = SDK(os.environ.get('RC_CLIENT_ID'), os.environ.get('RC_CLIENT_SECRET'), os.environ.get('RC_SERVER_URL'))
   platform = rcsdk.platform()
   

5. Authenticate a user using a personal JWT token:

   platform.login('username', 'extension_number', 'password')
   

6. Send an SMS from a user's own phone number to a recipient number:

   def send_sms(from_number):
       body_params = {
           'from': {'phoneNumber': from_number},
           'to': [{'phoneNumber': 'RECIPIENT'}],
           'text': 'Hello World!'
       }
       endpoint = '/restapi/v1.0/account/~/extension/~/sms'
       resp = platform.post(endpoint, body_params)
       json_obj = resp.json()
       print('SMS sent. Message id:', json_obj['id'])
       check_message_status(json_obj['id'])
   

7. Check the sending message status until it's out of the queued status:

   def check_message_status(message_id):
       endpoint = f'/restapi/v1.0/account/~/extension/~/message-store/{message_id}'
       resp = platform.get(endpoint)
       json_obj = resp.json()
       print('Message status:', json_obj['messageStatus'])
       if json_obj['messageStatus'] == 'Queued':
           time.sleep(2)
           check_message_status(json_obj['id'])
   

8. Replace 'RECIPIENT' with the actual recipient phone number in the send_sms function.

9. Run your code by executing the following command:

   python sms