Update verification examples in README

Author: timcraft

README.md

@@ -84,42 +84,55 @@ print 'The body of the message was:', message['body']
 Nexmo's [Verify API][doc_verify] makes it easy to prove that a user has provided their
 own phone number during signup, or implement second factor authentication during signin.
 
-You can start the verification process by calling the send_verification_request method:
+You can start the verification process by calling the start_verification method:
 
 ```python
-response = client.send_verification_request(number='441632960960', brand='MyApp')
+response = client.start_verification(number='441632960960', brand='MyApp')
 
 if response['status'] == '0':
-  print 'Started verification', response['request_id']
+  print 'Started verification request_id=' + response['request_id']
 else:
   print 'Error:', response['error_text']
 ```
 
+The response contains a verification request id which you will need to
+store temporarily (in the session, database, url etc).
+
 ### Controlling a verification
 
-To cancel an in-progress verification or to trigger the next attempt to
-send the confirmation code, call the control_verification_request method:
+Call the cancel_verification method with the verification request id
+to cancel an in-progress verification:
 
 ```python
-client.control_verification_request(cmd='cancel', request_id='00e6c3377e5348cdaf567e1417c707a5')
+client.cancel_verification('00e6c3377e5348cdaf567e1417c707a5')
+```
+
+Call the trigger_next_verification_event method with the verification
+request id to trigger the next attempt to send the confirmation code:
 
-client.control_verification_request(cmd='trigger_next_event', request_id='00e6c3377e5348cdaf567e1417c707a5')
+```python
+client.trigger_next_verification_event('00e6c3377e5348cdaf567e1417c707a5')
 ```
 
+The verification request id comes from the call to the start_verification method.
+
 ### Checking a verification
 
-To check a verification, call the check_verification_request method with
-the PIN code provided by the user and the id of the verification request:
+Call the check_verification method with the verification request id and the
+PIN code to complete the verification process:
 
 ```python
-response = client.check_verification_request(code='1234', request_id='00e6c3377e5348cdaf567e1417c707a5')
+response = client.check_verification('00e6c3377e5348cdaf567e1417c707a5', code='1234')
 
 if response['status'] == '0':
-  print 'Verification complete, event ', response['event_id']
+  print 'Verification complete, event_id=' + response['event_id']
 else:
   print 'Error:', response['error_text']
 ```
 
+The verification request id comes from the call to the start_verification method.
+The PIN code is entered into your application by the user.
+
 ### Start an outbound call
 
 Use Nexmo's [Call API][doc_call] to initiate an outbound voice call by calling