This tutorial demonstrates how to create a word-of-affirmation service using Twilio Programmable Messaging API and OpenAI API. The application sends positive messages to users, with one set of predefined messages and another that generates new messages using OpenAI's GPT-3 model. To follow this tutorial, you need Python 3.9 or higher, an IDE or code editor, a Twilio account, and an OpenAI developer account. The application is built using Flask, with HTML for the frontend interface. The user inputs their phone number to receive affirmations, which are then sent via SMS. The integration of OpenAI API allows for the generation of new messages based on prompts provided by the user.