Get Twilio credentials
First login to your Twilio Dashboard to retrieve Account SID and Auth Token
Next get a valid sender ID. Note: You will need to purchase at least one Phone number from Twilio to be able to send SMS.
Go to the Phone numbers tab on the left and take one of your purchased number as sender ID.
You can input these values into Spotipo by logging in the dashboard, and go to Settings-> SMS Gateway.
Select Twilio as SMS gateway and enter the Sender ID, Account SID and Auth Token and save the configuration.
Test the configuration by Clicking on Test and enter a phone number to send a test SMS.