Code hosted on AWS Lambda. Uses Twilio to handle sending / receiving sms.
For more info on how to get Twilio set up with AWS: https://www.twilio.com/docs/guides/receive-reply-sms-mms-python-amazon-lambda#whats-next-making-a-large-delta-with-twilio-and-lambda https://www.twilio.com/docs/guides/secure-amazon-lambda-python-app-validating-incoming-twilio-requests#passing-the-x-twilio-signature-header-through-api-gateway
- Twilio Account
- Amazon Web Services account (To host code on AWS Lambda)