It took me a little longer than it probably should have to get this up and running so I wanted to post some supplemental documentation to help other users out.

First, ensure in modules that Twilio is up to date and licensed.

You'll need a Twilio account, even a free account works for testing.

In the publisher configuration...

The Twilio account URL can be found by logging into Twilio and going to https://www.twilio.com/docs/sms/send-messages

On the right side from the languages click CURL. You'll see the HTTP POST call in the sample code, the first portion of this is the 'account URL'. In this example the account URL would be https://api.twilio.com/2010-04-01/Accounts

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Your account phone number should be entered with +1xxxxxxxxxx format for a US number.

Your Account SID and Authentification Token are available in your Twilio Console.

Send To Phone Number should be entered with +1xxxxxxxxxx for a US number.