Send followup SMS to volunteers upon task completion

[omardeleo]

This PR adds the Twilio SMS API library, in order to send volunteers a "Thank You" text message upon task completion.

Airtable Schema Updates

Two new fields are created in the Requests table:

• Followup SMS Sent?: tracks whether the volunteer has been sent a followup text upon task completion.

• Last modified time: tracks when the Status field was last updated. This is necessary to select only request records that have been marked Completed in the last day, so as to avoid sending a text to all volunteers who have completed a task ever and possibly overloading the system.

Dependencies Updates

Two new dependencies are added:

• twilio: Twilio API library
• phone: library to normalize mobile numbers into E.164 format, as required by Twilio.

Node Environment Variable Updates

Three new environment variables are added:

• TWILIO_ACCOUNT_SID
• TWILIO_AUTH_TOKEN
• TWILIO_PHONE_NUMBER

Testing

In order to test the text message functionality, follow these steps:

• Verify your personal mobile number (or a number for testing) with Twilio
• In your copy of Airtable, set the value of Followup SMS Sent? to Yes for all records with a Status of Completed
• Choose the most recently completed request record, and update the corresponding volunteer's phone number in the volunteers table with your personal/testing number
• If the most recently completed request was completed more than a day ago, change the value of Status to one of the other options, then change it back to Completed. This will update Last modified time
• Set Followup SMS Sent? to No for the most recently completed request record

Console

Followup SMS