Twilio Verify with Retry Logic

This demo of the Twilio Verify API includes best practices for SMS verification retry logic with Voice fallback and landline detection.

Pre-requisites

• A Verify Service. Create one in the Twilio Console

Environment variables

This project requires some environment variables to be set. To keep your tokens and secrets secure, make sure to not commit the .env file in git. When setting up the project with twilio serverless:init ... the Twilio CLI will create a .gitignore file that excludes .env from the version history.

In your .env file, set the following values:

Variable	Meaning	Required
ACCOUNT_SID	Find in the console	Yes
AUTH_TOKEN	Find in the console	Yes
VERIFY_SERVICE_SID	Create one here	Yes

Function Parameters

start-verify.js expects the following parameters:

Parameter	Description	Required
to	Either an email or phone number in E.164 format	Yes
channel	'sms' or 'call'. Default is 'sms'	No

check-verify.js expects the following parameters:

Parameter	Description	Required
to	Either an email or phone number in E.164 format	Yes
code	Collected from user input	Yes

Create a new project with the template

1. Install the Twilio CLI
2. Install the serverless toolkit

twilio plugins:install @twilio-labs/plugin-serverless

3. Initiate a new project

twilio serverless:init verify-retry-sample --template=verify-retry && cd verify-retry-sample

4. Add your environment variables to .env:

Make sure variables are populated in your .env file. See Environment variables.

5. Start the server :

twilio serverless:start

5. Open the web page at https://localhost:3000/index.html and enter your phone number to test

ℹ️ Check the developer console and terminal for any errors, make sure you've set your environment variables.

Deploying

Deploy your functions and assets with either of the following commands. Note: you must run these commands from inside your project folder. More details in the docs.

With the Twilio CLI:

twilio serverless:deploy